Yes, after pulling 4661e5d6ef7209c02d15a0e37d8ed594a98eaeb3 we wiped 
the database and reinstalled. Saving contacts works now. Thanks!

But the "strlen() expects parameter 1" and 
"mysqli::real_escape_string()" log messages persist.

Indeed, duplicate of bug #9841.

Possibly related to bug: 9905 or bug: 9841

Just noticed the double comma here:
We didn't change anything in turba/config/backends.php.

I tried to sync with my phone before, but all actions are taken in the 
web interface.

I click on "new contact" and get:
2011-04-19T18:51:06+02:00 WARN: HORDE [turba] PHP ERROR: strlen() 
expects parameter 1 to be string, object given [pid 3052 on line 450 
of 
"/var/www/webmail.rekursion.net/horde-git/framework/Form/lib/Horde/Form/Renderer.php"]

I enter some data and click "add":
2011-04-19T18:46:10+02:00 WARN: HORDE [turba] PHP ERROR: 
mysqli::real_escape_string() expects parameter 1 to be string, array 
given [pid 3052 on line 194 of 
"/var/www/webmail.rekursion.net/horde-git/framework/Db/lib/Horde/Db/Adapter/Mysqli.php"]

Changing to 'mysql pdo'  generates different messages:
2011-04-19T18:53:24+02:00 WARN: HORDE [turba] PHP ERROR: PDO::quote() 
expects parameter 1 to be string, array given [pid 3052 on line 165 of 
"/var/www/webmail.rekursion.net/horde-git/framework/Db/lib/Horde/Db/Adapter/Pdo/Base.php"]
2011-04-19T18:53:24+02:00 ERR: HORDE [turba] SQL QUERY FAILED: 
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an 
error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near ' '', '', '', 
'', '', 'mario@example.com', '20110419185324.pHjJT9EhkVZNrb4EUnVgvsA' 
at line 1
   INSERT INTO turba_objects (object_type, object_firstname,
     object_lastname, object_middlenames, object_nameprefix,
     object_namesuffix, object_alias, object_bday, object_photo,
     object_homestreet, object_homepob, object_homecity,
     object_homeprovince, object_homepostalcode, object_homecountry,
     object_workstreet, object_workpob, object_workcity,
     object_workprovince, object_workpostalcode, object_workcountry,
     object_tz, object_email, object_homephone, object_workphone,
     object_cellphone, object_fax, object_pager, object_title, object_role,
     object_company, object_logo, object_category, object_notes,
     object_url, object_freebusyurl, object_pgppublickey,
     object_smimepublickey, owner_id, object_uid, object_id) VALUES
     ('Object', '', 'test', '', '', '', '', NULL, NULL, '', '', '', '', '',
     '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',
     NULL, , '', '', '', '', '', 'mario@example.com',
     '20110419185324.pHjJT9EhkVZNrb4EUnVgvsA@webmail.rekursion.net',
     'XjfqRdEhkVZNrb4EUoFgvsA') [pid 3052 on line 792 of 
"/var/www/webmail.rekursion.net/horde-git/framework/Db/lib/Horde/Db/Adapter/Base.php"]
2011-04-19T18:53:24+02:00 ERR: HORDE [turba] SQLSTATE[42000]: Syntax 
error or access violation: 1064 You have an error in your SQL syntax; 
check the manual that corresponds to your MySQL server version for the 
right syntax to use near ' '', '', '', '', '', 'mario@example.com', 
'20110419185324.pHjJT9EhkVZNrb4EUnVgvsA' at line 1 [pid 3052 on line 
382 of 
"/var/www/webmail.rekursion.net/horde-git/turba/lib/Driver/Sql.php"]
2011-04-19T18:53:24+02:00 WARN: HORDE [turba] PHP ERROR: strlen() 
expects parameter 1 to be string, object given [pid 3052 on line 450 
of 
"/var/www/webmail.rekursion.net/horde-git/framework/Form/lib/Horde/Form/Renderer.php"]

Doing *what*? At least the last error message should only happen when 
using Turba's API.
Did you change anything in config/backends.php? Are you using a custom 
backend?
Does it make any difference if you the mysql driver instead of the 
mysqli driver?

Hello,
We just installed horde from git. Turba should store it's contacts 
into a mysql database. However the following messages appear in the 
log file:

2011-04-19T00:36:42+02:00 WARN: HORDE [turba] PHP ERROR: strlen() 
expects parameter 1 to be string, object given [pid 16138 on line 450 
of 
"/var/www/webmail.rekursion.net/horde-git/framework/Form/lib/Horde/Form/Renderer.php"]
2011-04-19T00:36:47+02:00 WARN: HORDE [turba] PHP ERROR: 
mysqli::real_escape_string() expects parameter 1 to be string, array 
given [pid 16132 on line 194 of 
"/var/www/webmail.rekursion.net/horde-git/framework/Db/lib/Horde/Db/Adapter/Mysqli.php"]
2011-04-19T00:36:50+02:00 EMERG: HORDE [horde] Already Exists [pid 
16138 on line 709 of 
"/var/www/webmail.rekursion.net/horde-git/turba/lib/Api.php"]