Tickets :: [#9766] JS error during mailbox loading

6.0.0-alpha12

6/8/25

Summary	JS error during mailbox loading
Queue	IMP
Queue Version	Git master
Type	Bug
State	Resolved
Priority	1. Low
Owners	slusarz (at) horde (dot) org
Requester	jan (at) horde (dot) org
Created	03/31/2011 (5183 days ago)
Due
Updated	10/14/2011 (4986 days ago)
Assigned	04/19/2011 (5164 days ago)
Resolved	10/14/2011 (4986 days ago)
Github Issue Link
Github Pull Request
Milestone
Patch	No

10/14/2011 08:22:55 PM	Michael Slusarz	Comment #24 State ⇒ Resolved	Reply to this comment
Marking as fixed. Reopen if issue reoccurs.

10/03/2011 01:12:19 PM	Jan Schneider	Comment #23	Reply to this comment
Yes, I was watching those commits with interest because I figured that they may fix my issues. I haven't seen those errors happening since then. I'll keep watching and close the ticket if they don't pop up again within a few days.

09/28/2011 08:12:00 PM	Michael Slusarz	Comment #22	Reply to this comment
Back again... While optimizing viewport recently with the new message deletion code, it seems that there was a rare opportunity for a race condition in the previous code that may have caused this issue. So maybe this newer code has fixed this issue.

08/04/2011 05:54:04 PM	Michael Slusarz	Comment #21	Reply to this comment
It may not be an option, but have you tried using a different IMAP server?

08/04/2011 08:16:11 AM	Jan Schneider	Comment #20	Reply to this comment
I still see this, once or twice a day. Very annoying, but since I can't reproduce it reliably, it's really hard to track down.

08/03/2011 09:39:31 PM	Michael Slusarz	Comment #19	Reply to this comment
[Show Quoted Text - 23 lines][Hide Quoted Text] I still see this. Can you give me a quick overview of what's in the viewPort response. IIUC the message count in there is wrong? Where is it? Here's what you need to do: 1. Isolate the first load request for the mailbox where you encounter the error. This provides the initial state of the browser mailbox DB. 2. Find the delete Messages request that causes the error. 3. From these 2 you can figure out the index that originally existed, but no longer exists, that is causing the error. 4. Given this sequence number/UID (also the cacheID values of the mailboxes), you should take a look at the IMAP logs of the delete request to see if anything looks strange. Also, pay attention to reported number of messages in the mailbox - as I previously mentioned, in all the cases I've seen that you have posted, it looks like there is an off-by-one error somewhere in this message count. The goal is to determine why the browser is dropping the DB record of a message/UID that 1) still exists (according to IMAP and IMP server) and 2) the browser previously reported to IMP server that it had cached (the cache variable sent back in viewport requests). Ping on this? Nobody else has reported this issue, so I'm going to mark as stalled unless we (you) can find a way to reliably reproduce and/or point to the area of the code that is allegedly broken.

05/20/2011 05:21:54 AM	Michael Slusarz	Comment #18	Reply to this comment
I still see this. Can you give me a quick overview of what's in the viewPort response. IIUC the message count in there is wrong? Where is it? Here's what you need to do: 1. Isolate the first load request for the mailbox where you encounter the error. This provides the initial state of the browser mailbox DB. 2. Find the delete Messages request that causes the error. 3. From these 2 you can figure out the index that originally existed, but no longer exists, that is causing the error. 4. Given this sequence number/UID (also the cacheID values of the mailboxes), you should take a look at the IMAP logs of the delete request to see if anything looks strange. Also, pay attention to reported number of messages in the mailbox - as I previously mentioned, in all the cases I've seen that you have posted, it looks like there is an off-by-one error somewhere in this message count. The goal is to determine why the browser is dropping the DB record of a message/UID that 1) still exists (according to IMAP and IMP server) and 2) the browser previously reported to IMP server that it had cached (the cache variable sent back in viewport requests).

05/18/2011 03:23:58 PM	Jan Schneider	Comment #17	Reply to this comment
I still see this. Can you give me a quick overview of what's in the viewPort response. IIUC the message count in there is wrong? Where is it?

05/13/2011 07:16:58 AM	Michael Slusarz	Comment #16 Priority ⇒ 1. Low	Reply to this comment
I'll try one more time - fixed? If not, I'm going to close this ticket (unless you are willing to track down) because I can't reproduce, the symptoms don't make sense, and nobody else has reported this issue.

04/19/2011 01:48:51 PM	Jan Schneider	Comment #15	Reply to this comment
No, it didn't help.

04/19/2011 05:50:32 AM	Michael Slusarz	Comment #14 Assigned to Michael Slusarz State ⇒ Feedback	Reply to this comment
The message count was 18 before the delete request - 1 message was deleted - and the message count was 16. Sounds suspiciously like Bug ~~#9915~~. Check to see if the fix there helps here before I do any further debugging.

04/19/2011 02:57:41 AM	Michael Slusarz	Comment #13	Reply to this comment
There is one other horde.bugs viewPort request though that is suspicious because it returned false, or is the expected? Expected. 'checkcache' tells the server to only return data if the cache has changed.

04/18/2011 07:51:05 PM	Jan Schneider	Comment #12	Reply to this comment
There is one other horde.bugs viewPort request though that is suspicious because it returned false, or is the expected? view:INBOX.horde.bugs cacheid:V1082203163\|U48062\|M107\|9\|1 slice:28:83 cache:{16}INBOX.horde.bugs40732,40755,40858,40988,41087,41117,41120,41277,41406,41428,41453,41606,41633,42593,42975,43214,43776,44267,44475,44872,44897,44913,44937,45033,45108,45128,45185,45188:45189,45219,45247,45278,45323,45370,45534,45570,45579:45580,45602,45612,45665,45808,45822,45871,45946,46156,46175,46219,46350,46498,46644,46838:46839,47188,47230,47300,47329,47332,47351,47366,47372,47385,47428,47447,47530,47585,47592,47614,47666,47679,47765,47825,47830,47833,47909,47931,47942,47945:47946,47949:47954,47991:47993,47996,48000,48002:48003,48005,48012,48017,48059,48061 checkcache:1 /-secure-{"response":false}/

04/18/2011 07:49:38 PM	Jan Schneider	New Attachment: horde.cvs.txt

04/18/2011 07:49:20 PM	Jan Schneider	Comment #11 New Attachment: horde.bugs.txt	Reply to this comment
Since I don't know the deletion in horde.cvs or the viewport loading of horde.bugs is the problem, here are the original viewPort results of both.

04/18/2011 07:44:56 PM	Jan Schneider	Comment #10 New Attachment: bug9766[1].txt	Reply to this comment
Next try. deleteMessage: view:INBOX.horde.cvs cacheid:V991562206\|U93796\|M18\|1\|1 slice:1:71 cache:{15}INBOX.horde.cvs69762,69775,69778,70496,75382:75384,76595,82258:82259,84297,87437,88016,88926,90035,91220,91419,93795 uid:{15}INBOX.horde.cvs93795 /-secure-{"response":{"deleted":{"mbox":"INBOX.horde.cvs","uids":"{15}INBOX.horde.cvs93795","remove":1},"ViewPort":{"updatecacheid":"V991562206\|U93796\|M16\|1\|1","view":"INBOX.horde.cvs"},"poll":{"INBOX.horde.cvs":0},"quota":{"m":"73% von 512MB","p":73}}}/ viewPort: view:INBOX.horde.bugs cacheid:V1082203163\|U48062\|M107\|9\|1 slice:1:56 cache:{16}INBOX.horde.bugs40732,40755,40858,40988,41087,41117,41120,41277,41406,41428,41453,41606,41633,42593,42975,43214,43776,44267,44475,44872,44897,44913,44937,45033,45108,45128,45185,45188:45189,45219,45247,45278,45323,45370,45534,45570,45579:45580,45602,45612,45665,45808,45822,45871,45946,46156,46175,46219,46350,46498,46644,46838:46839,47188,47230,47300,47329,47332,47351,47366,47372,47385,47428,47447,47530,47585,47592,47614,47666,47679,47765,47825,47830,47833,47909,47931,47942,47945:47946,47949:47954,47991:47993,47996,48000,48002:48003,48005,48012,48017,48059,48061 checkcache:1 /-secure-{"response":{"ViewPort":{"cacheid":"V1082203163\|U48066\|M111\|9\|1","data":{"48063":{"imapuid":48063,"view":"INBOX.horde.bugs","flag":["unseen","personal"],"draft":1,"size":"4 KB","date":"20:48:15","from":"bugs@horde.org","subject":"[Tickets ~~#9905~~] Re: save contacts"},"48062":{"imapuid":48062,"view":"INBOX.horde.bugs","flag":["unseen","personal"],"draft":1,"size":"4 KB","date":"20:46:03","from":"bugs@horde.org","subject":"[Tickets ~~#9905~~] Re: save contacts"},"48064":{"imapuid":48064,"view":"INBOX.horde.bugs","flag":["unseen","personal"],"draft":1,"size":"4 KB","date":"19:30:42","from":"bugs@horde.org","subject":"[Tickets ~~#9814~~] Re: New tasklist not showing up"},"48065":{"imapuid":48065,"view":"INBOX.horde.bugs","flag":["unseen","personal"],"draft":1,"size":"4 KB","date":"19:30:09","from":"bugs@horde.org","subject":"[Tickets ~~#9814~~] Re: New tasklist not showing up"}},"metadata":{"readonly":0,"unseen":62,"thread":{"48063":"3","48062":"4","48064":"3","48065":"4","48059":"","48061":"3","48017":"4","48012":"","48003":"","48000":"","47996":"","47993":"","47942":"","48005":"3","48002":"2","47992":"2","47991":"2","47954":"2","47953":"2","47952":"2","47951":"2","47950":"2","47949":"2","47946":"2","47945":"2","47931":"4","47909":"","47833":"","47830":"","47825":"","47666":"","47679":"","47614":"","47592":"3","47585":"4","47530":"","47372":"","47351":"3","47332":"4","47329":"","47447":"3","47385":"2","47366":"2","47300":"","47230":"","47188":"","46644":"","46498":"","46350":"","46219":"","46175":"","46156":"","45946":"","45871":"","45822":"","45808":""}},"rowlist":{"48063":1,"48062":2,"48064":3,"48065":4,"48059":5,"48061":6,"48017":7,"48012":8,"48003":9,"48000":10,"47996":11,"47993":12,"47942":13,"48005":14,"48002":15,"47992":16,"47991":17,"47954":18,"47953":19,"47952":20,"47951":21,"47950":22,"47949":23,"47946":24,"47945":25,"47931":26,"47909":27,"47833":28,"47830":29,"47825":30,"47666":31,"47679":32,"47614":33,"47592":34,"47585":35,"47530":36,"47372":37,"47351":38,"47332":39,"47329":40,"47447":41,"47385":42,"47366":43,"47300":44,"47230":45,"47188":46,"46644":47,"46498":48,"46350":49,"46219":50,"46175":51,"46156":52,"45946":53,"45871":54,"45822":55,"45808":56},"totalrows":111,"view":"INBOX.horde.bugs","update":1},"poll":{"INBOX.horde.bugs":62},"quota":{"m":"73% von 512MB","p":73}}}/

04/18/2011 07:42:05 PM	Jan Schneider	Deleted Original Message

04/14/2011 07:01:27 PM	Michael Slusarz	Comment #9	Reply to this comment
So... your browser reports that it has 229688 in its cache: cache:{5}INBOX[...],229688,[...] But this entry doesn't exist in the data hash. Not sure if you still have access to the javascript request logs, but it would be useful to know what the initial load of INBOX looked like - namely, if the browser ever sent the data to the browser, or if the browser somehow lost the data entry along the way.

04/14/2011 06:34:46 PM	Jan Schneider	Comment #8	Reply to this comment
Also, it is useful to indicate the last action you were doing (JSON request/response). If there were several requests in a row after your last human-triggered action, provide the details of all those requests (e.g. you initiated a deleteMessage, which was immediately followed by a ViewPort request). deleteMessages: view:INBOX.horde.cvs cacheid:V991562206\|U93757\|M18\|1\|1 slice:1:71 cache:{15}INBOX.horde.cvs69762,69775,69778,70496,75382:75384,76595,82258:82259,84297,87437,88016,88926,90035,91220,91419,93756 uid:{15}INBOX.horde.cvs93756 /-secure-{"response":{"deleted":{"mbox":"INBOX.horde.cvs","uids":"{15}INBOX.horde.cvs93756","remove":1},"ViewPort":{"updatecacheid":"V991562206\|U93757\|M16\|1\|1","view":"INBOX.horde.cvs"},"poll":{"INBOX.horde.cvs":0},"quota":{"m":"77% von 512MB","p":76}}}/ viewPort: view:INBOX cacheid:V968256253\|U229698\|M126\|9\|1 slice:1:56 cache:{5}INBOX207531,207671,208041,208282:208283,208285:208286,208299:208300,208303:208304,208306,208310,208319,208324,208328,208367,208372,212054,213533,213681,213960:213961,215418,215546,216366,216809,216874,218813,218999,219399,219403,222960,225664,225701,225918,226409,226480,226868,227085,227459:227460,228044,228139:228140,228142:228143,228314,228317,228441,229451,229490,229535,229672,229688,229692 checkcache:1 /-secure-{"response":{"ViewPort":{"cacheid":"V968256253\|U229702\|M130\|9\|1","data":{"229699":{"imapuid":229699,"view":"INBOX","flag":["unseen","personal"],"draft":1,"size":"4 KB","date":"15.04.2011","from":"Ezra Platt","subject":"Ingrid, Good Afternoon Vernona"},"229701":{"imapuid":229701,"view":"INBOX","flag":["unseen","personal"],"draft":1,"size":"3 KB","date":"20:04:00","from":"nobody","subject":"PHP error_log message"},"229700":{"imapuid":229700,"view":"INBOX","flag":["unseen","personal"],"draft":1,"size":"3 KB","date":"20:03:16","from":"nobody","subject":"PHP error_log message"},"229698":{"imapuid":229698,"view":"INBOX","flag":["unseen","personal"],"draft":1,"size":"3 KB","date":"19:55:22","from":"munin@wg.de","subject":"Munin notification"}},"metadata":{"readonly":0,"unseen":13,"thread":{"229699":"","229701":"3","229700":"4","229698":"","229688":"","229672":"","229692":"","229535":"","229490":"","229451":"","228441":"","228317":"3","228314":"2","228139":"4","228140":"","228044":"","228142":"","228143":"","227460":"","227459":"","227085":"3","226868":"","226480":"3","226409":"","225918":"","225701":"","225664":"","222960":"","219403":"3","219399":"","218999":"","218813":"","216874":"","216809":"","216366":"","215546":"","215418":"","213961":"","213960":"","213681":"","213533":"","212054":"","208319":"","208372":"3","208367":"2","208328":"2","208324":"2","208310":"2","208306":"103","208304":"13","208303":"2","208300":"13","208299":"2","208286":"2","208285":"103","208283":"13"}},"rowlist":{"229699":1,"229701":2,"229700":3,"229698":4,"229688":5,"229672":6,"229692":7,"229535":8,"229490":9,"229451":10,"228441":11,"228317":12,"228314":13,"228139":14,"228140":15,"228044":16,"228142":17,"228143":18,"227460":19,"227459":20,"227085":21,"226868":22,"226480":23,"226409":24,"225918":25,"225701":26,"225664":27,"222960":28,"219403":29,"219399":30,"218999":31,"218813":32,"216874":33,"216809":34,"216366":35,"215546":36,"215418":37,"213961":38,"213960":39,"213681":40,"213533":41,"212054":42,"208319":43,"208372":44,"208367":45,"208328":46,"208324":47,"208310":48,"208306":49,"208304":50,"208303":51,"208300":52,"208299":53,"208286":54,"208285":55,"208283":56},"totalrows":130,"view":"INBOX","update":1},"poll":{"INBOX":13},"quota":{"m":"77% von 512MB","p":76}}}/

04/14/2011 06:32:50 PM	Jan Schneider	Comment #7 New Attachment: bug9766.txt	Reply to this comment
Put the resulting JSON into an attachment.

04/13/2011 05:24:22 PM	Michael Slusarz	Comment #6	Reply to this comment
This still happens regularly. Anything else I can do to track this down? Catching this error in ViewPort.update() gives another error instead: /headhorde/imp/js/dimpbase.js:696 Uncaught TypeError: Cannot call method 'size' of undefined Next time this happens, run the following in the JS console: DimpBase.viewport._getBuffer().debug() Put the resulting JSON into an attachment. Also, it is useful to indicate the last action you were doing (JSON request/response). If there were several requests in a row after your last human-triggered action, provide the details of all those requests (e.g. you initiated a deleteMessage, which was immediately followed by a ViewPort request).

04/13/2011 05:01:01 PM	Jan Schneider	Comment #5 Priority ⇒ 2. Medium	Reply to this comment
This still happens regularly. Anything else I can do to track this down? Catching this error in ViewPort.update() gives another error instead: /headhorde/imp/js/dimpbase.js:696 Uncaught TypeError: Cannot call method 'size' of undefined

04/05/2011 11:15:52 PM	Michael Slusarz	Comment #4	Reply to this comment
Just seen it again. Here's the stack: Nothing too strange in here. The only thing that looks a little fishy is that the cache ID is reporting 154 messages in the mailbox: "cacheid":"V991562227\|U46525\|M154\|9\|1" But later, the total rows is indicated as 155: "totalrows":155 Maybe a message was delivered between beginning and ending of processing? But even then, this theoretically shouldn't break things - there was just need to be another update on the next server access.

04/05/2011 09:33:20 PM	Jan Schneider	Comment #3	Reply to this comment
Just seen it again. Here's the stack: onException #<Hash:{'message': 'Cannot set property \'VP_rownum\' of undefined', 'stack': 'TypeError: Cannot set property \'VP_rownum\' of undefined\n at klass.<anonymous> (http://neo.wg.de/headhorde/imp/js/viewport.js:1501:44)\n at http://neo.wg.de/headhorde/js/prototype.js:825:18\n at klass._each (http://neo.wg.de/headhorde/js/prototype.js:1237:7)\n at klass.each (http://neo.wg.de/headhorde/js/prototype.js:824:12)\n at klass.update (http://neo.wg.de/headhorde/imp/js/viewport.js:1500:11)\n at klass._ajaxResponse (http://neo.wg.de/headhorde/imp/js/viewport.js:863:16)\n at klass.parseJSONResponse (http://neo.wg.de/headhorde/imp/js/viewport.js:844:18)\n at Object.onDoActionComplete (http://neo.wg.de/headhorde/imp/js/dimpbase.js:3481:27)\n at Object.doActionComplete (http://neo.wg.de/headhorde/imp/js/dimpcore.js:210:18)\n at http://neo.wg.de/headhorde/imp/js/dimpbase.js:547:26', 'type': 'non_object_property_store', 'arguments': ['VP_rownum', undefined], 'name': 'TypeError'}> And these are two requests right before that: deleteMessage view:INBOX.horde.dev cacheid:V991562227\|U46525\|M156\|9\|1 slice:1:66 cache:{15}INBOX.horde.dev40218,40758,40801,41027,41064,41068:41069,41173,41288,41587,41774,42359,42481,42495,42589:42592,42598,42607,42613,42615:42616,42618:42619,42631,42634,42793,42802,43020,43747,44245:44246,44260,44262,44523:44526,44543:44544,44546,44549,44557:44561,44584,44588:44589,44591:44592,44609,44734,44745,45384,45387,45390,45402,45416,45966,45972,45980,45985,46524 uid:{15}INBOX.horde.dev46524 /-secure-{"response":{"deleted":{"mbox":"INBOX.horde.dev","uids":"{15}INBOX.horde.dev46524","remove":1},"ViewPort":{"cacheid":"V991562227\|U46525\|M154\|9\|1","data":{"39879":{"imapuid":39879,"view":"INBOX.horde.dev","flag":["\\seen"],"draft":1,"size":"6 KB","date":"15.10.2008","from":"duck","subject":"Re: [core] horde hosting service","listmsg":1}},"metadata":{"readonly":0,"unseen":0,"thread":{"45985":"003","45980":"03","45972":"3","45966":"","45402":"03","45416":"013","45390":"02","45387":"3","45384":"","44734":"","44561":"03","44558":"3","44546":"13","44544":"2","44543":"","44559":"03","44560":"0103","44557":"013","44549":"02","44745":"0100003","44592":"010003","44591":"01003","44609":"0100103","44589":"010013","44588":"01002","44584":"0103","44526":"013","44525":"02","44524":"3","44523":"","44262":"003","44260":"03","44246":"3","44245":"","43747":"","43020":"","42619":"00000003","42618":"0000003","42616":"000003","42615":"00003","42613":"0003","42607":"003","42598":"03","42495":"3","42481":"","42802":"000003","42793":"00003","42634":"0003","42631":"003","42592":"03","42590":"013","42591":"02","42589":"3","42359":"","41774":"","41587":"","41288":"","41173":"","41069":"03","41068":"3","41064":"","41027":"","40801":"","40758":"","40218":"","39879":"03"}},"rowlist":{"45985":1,"45980":2,"45972":3,"45966":4, "45402":5,"45416":6,"45390":7,"45387":8,"45384":9,"44734":10,"44561":11,"44558":12,"44546":13,"44544":14,"44543":15,"44559":16,"44560":17,"44557":18,"44549":19,"44745":20,"44592":21,"44591":22,"44609":23,"44589":24,"44588":25,"44584":26,"44526":27,"44525":28,"44524":29,"44523":30,"44262":31,"44260":32,"44246":33,"44245":34,"43747":35,"43020":36,"42619":37,"42618":38,"42616":39,"42615":40,"42613":41,"42607":42,"42598":43,"42495":44,"42481":45,"42802":46,"42793":47,"42634":48,"42631":49,"42592":50,"42590":51,"42591":52,"42589":53,"42359":54,"41774":55,"41587":56,"41288":57,"41173":58,"41069":59,"41068":60,"41064":61,"41027":62,"40801":63,"40758":64,"40218":65,"39879":66},"totalrows":155,"view":"INBOX.horde.dev","update":1,"disappear":[46524]},"poll":{"INBOX.horde.dev":0}}}/ viewPort view:INBOX.horde.cvs cacheid:V991562206\|U93470\|M16\|1\|1 slice:1:87 cache:{15}INBOX.horde.cvs69762,69775,69778,70496,75382:75384,76595,82258:82259,84297,87437,88016,88926,90035,91220,91419,93381 checkcache:1 /-secure-{"response":{"ViewPort":{"cacheid":"V991562206\|U93472\|M20\|1\|1","data":{"93471":{"imapuid":93471,"view":"INBOX.horde.cvs","flag":["unseen"],"draft":1,"size":"5 KB","date":"23:22:27","from":"Michael M Slusarz","subject":"[commits] Horde branch master updated. c2a2ec543eeb5514c4883682a563d91c6f267668"},"93470":{"imapuid":93470,"view":"INBOX.horde.cvs","flag":["unseen"],"draft":1,"size":"8 KB","date":"23:18:52","from":"Michael M Slusarz","subject":"[commits] Horde branch master updated. a9fe4dfb0a67fb51cd82c06a39808d7b3f8d0d0a"}},"metadata":{"readonly":0,"unseen":2},"rowlist":{"93471":1,"93470":2,"93381":3,"91419":4,"91220":5,"90035":6,"88926":7,"88016":8,"87437":9,"84297":10,"82259":11,"82258":12,"76595":13,"75384":14,"75383":15,"75382":16,"70496":17,"69778":18,"69775":19,"69762":20},"totalrows":20,"view":"INBOX.horde.cvs","update":1}}}/

03/31/2011 10:05:06 PM	Michael Slusarz	Comment #2	Reply to this comment
Tracing the exception stack, I think the problem would be that the AJAX return listed an IMAP UID in the rowlist, but had no corresponding data entry. But I have no idea how this happened. Could be a session cache issue, could be a browser cache issue, could be broken data for a message that caused that message data to be null, etc. Without a reliable way to reproduce, not sure if we can do much with this ticket.

03/31/2011 09:48:00 PM	Jan Schneider	Comment #1 Priority ⇒ 1. Low State ⇒ Unconfirmed Patch ⇒ No Milestone ⇒ Summary ⇒ JS error during mailbox loading Type ⇒ Bug Queue ⇒ IMP	Reply to this comment
Not sure what caused it, but loading one mailbox caused intermittent problems. I'm not sure if the error in the js log is from that problem, or from navigating to another mailbox after that. Anyway, here it is: 33onException #<Hash:{'message': 'Cannot set property \'VP_rownum\' of undefined', 'stack': 'TypeError: Cannot set property \'VP_rownum\' of undefined\n at klass.<anonymous> (http://neo.wg.de/headhorde/imp/js/viewport.js:1501:44)\n at http://neo.wg.de/headhorde/js/prototype.js:825:18\n at klass._each (http://neo.wg.de/headhorde/js/prototype.js:1237:7)\n at klass.each (http://neo.wg.de/headhorde/js/prototype.js:824:12)\n at klass.update (http://neo.wg.de/headhorde/imp/js/viewport.js:1500:11)\n at klass._ajaxResponse (http://neo.wg.de/headhorde/imp/js/viewport.js:863:16)\n at klass.parseJSONResponse (http://neo.wg.de/headhorde/imp/js/viewport.js:844:18)\n at Object.onDoActionComplete (http://neo.wg.de/headhorde/imp/js/dimpbase.js:3481:27)\n at Object.doActionComplete (http://neo.wg.de/headhorde/imp/js/dimpcore.js:210:18)\n at http://neo.wg.de/headhorde/imp/js/dimpbase.js:547:26', 'type': 'non_object_property_store', 'arguments': ['VP_rownum', undefined], 'name': 'TypeError'}>