Works fine in current code.

Same issue we are having running Turba 2.3.3.

The source.php in question:

$cfgSources['pers_sql'] = array(
     'title' => _("My Address Book"),
     'type' => 'sql',
     'charset' => 'utf-8',
     // The default connection details are pulled from the Horde-wide SQL
     // connection configuration.
     'params' => array_merge($GLOBALS['conf']['sql'], array('table' => 
'turba_objects')),
     // Using two tables as datasource.
     // 'params' => array_merge($GLOBALS['conf']['sql'],
     //                         array('table' => 'leaddetails LEFT 
JOIN leadaddress ON leaddetails.leadid = leadaddress.leadaddressid',
     //                               'filter' => 
'leaddetails.converted = 0')),
     'map' => array(
         '__key' => 'object_id',
         '__owner' => 'owner_id',
         '__type' => 'object_type',
         '__members' => 'object_members',
         '__uid' => 'object_uid',
         'firstname' => 'object_firstname',
         'lastname' => 'object_lastname',
         'middlenames' => 'object_middlenames',
         'namePrefix' => 'object_nameprefix',
         'nameSuffix' => 'object_namesuffix',
         // 'name' => array('fields' => array('namePrefix', 'firstname',
         //                                   'middlenames', 'lastname',
         //                                   'nameSuffix'),
         //                 'format' => '%s %s %s %s %s',
         //                 'parse' => array(
         //                     array('fields' => array('firstname', 
'middlenames',
         //                                             'lastname'),
         //                           'format' => '%s %s %s'),
         //                     array('fields' => array('firstname', 
'lastname'),
         //                           'format' => '%s %s'))),
         // This is a shorter version of a "name" composite field which only
         // consists of the first name and last name.
         'name' => array('fields' => array('firstname', 'lastname'),
                         'format' => '%s %s'),
         'alias' => 'object_alias',
         'birthday' => 'object_bday',
         // The photo field requires at least Horde 3.3 and a matching type
         // field.
         'photo' => 'object_photo',
         'phototype' => 'object_phototype',
         'homeStreet' => 'object_homestreet',
         'homePOBox' => 'object_homepob',
         'homeCity' => 'object_homecity',
         'homeProvince' => 'object_homeprovince',
         'homePostalCode' => 'object_homepostalcode',
         'homeCountry' => 'object_homecountry',
         // This is an example composite field for addresses, so you 
can display
         // the various map links. If you use this, be sure to add 
'homeAddress'
         // to the 'tabs' parameter below.
         'homeAddress' => array('fields' => array('homeStreet', 'homeCity',
                                                  'homeProvince',
                                                  'homePostalCode'),
                                'format' => "%s \n %s, %s  %s"),
         'workStreet' => 'object_workstreet',
         'workPOBox' => 'object_workpob',
         'workCity' => 'object_workcity',
         'workProvince' => 'object_workprovince',
         'workPostalCode' => 'object_workpostalcode',
         'workCountry' => 'object_workcountry',
         'timezone' => 'object_tz',
         'email' => 'object_email',
         'homeEmail' => 'object_email_home',
         'workEmail' => 'object_email_work',
         'homePhone' => 'object_homephone',
         'workPhone' => 'object_workphone',
         'cellPhone' => 'object_cellphone',
         'fax' => 'object_fax',
         'pager' => 'object_pager',
         'title' => 'object_title',
         'role' => 'object_role',
         'company' => 'object_company',
         // The logo field requires at least Horde 3.3 and a matching type
         // field.
         // 'logo' => 'object_logo',
         // 'logotype' => 'object_logotype',
         'category' => 'object_category',
         'notes' => 'object_notes',
         'website' => 'object_url',
         'freebusyUrl' => 'object_freebusyurl',
         'pgpPublicKey' => 'object_pgppublickey',
         'smimePublicKey' => 'object_smimepublickey',
     ),
     'tabs' => array(
         _("Personal") => array('firstname', 'lastname', 'middlenames',
                                'namePrefix', 'nameSuffix', 'name', 'alias',
                                'birthday', 'photo'),
         _("Location") => array('homeStreet', 'homePOBox', 'homeCity',
                                'homeProvince', 'homePostalCode', 
'homeCountry',
                                'workStreet', 'workPOBox', 'workCity',
                                'workProvince', 'workPostalCode', 
'workCountry',
                                'timezone'),
         _("Communications") => array('email', 'homeEmail', 
'workEmail', 'homePhone', 'workPhone',
                                      'cellPhone', 'fax', 'pager'),
         _("Organization") => array('title', 'role', 'company', 'logo'),
         _("Other") => array('category', 'notes', 'website', 'freebusyUrl',
                             'pgpPublicKey', 'smimePublicKey'),
     ),
     'search' => array(
         'name',
         'email',
         'homeEmail',
         'workEmail',
         'homePhone',
         'workPhone',
         'cellPhone'
     ),
     'strict' => array(
         'object_id',
         'owner_id',
         'object_type',
     ),
     'export' => true,
     'browse' => true,
     'use_shares' => true,
     'list_name_field' => 'lastname',
     'alternative_name' => 'company',
);

What does your turba/config/sources.php look like?  I'm able to import 
this file OK via the test suite.

Sorry for the late reply. The error occurs with the attached LDIF file 
created as export from a Turba 2.3.3 addressbook which worked fine 
with 2.3.2.

What are the values of $values['mozillaHomeLocalityName'] and 
$values['mozillaHomeState'] on line 257?

Do you have a sample LDIF file that demonstrates the problem?

With new 2.3.3 release the import of LDIF contacts exported by turba 
fail with the following message in the logifle:
Dec 22 10:29:34 h1397077 apache2: PHP Fatal error:  Cannot use 
assign-op operators with overloaded objects nor string offsets in 
/var/www/horde/turba/lib/Data/ldif.php on line 257
Dec 22 10:30:08 h1397077 HORDE[25975]: PHP Fatal error:  Cannot use 
assign-op operators with overloaded objects nor string offsets in 
/var/www/horde/turba/lib/Data/ldif.php on line 257