Switching between languages on the translation page after saving translation for Instant Chat gives:

Fatal error: Call to a member function getLabel() on a non-object in /xxxxxx/ow_system_plugins/admin/controllers/languages.php on line 153

I used in the upper language selector English
and the mid page selector a local language
made the translations and saved the page
Then I tried to switch the upper selector to the same local language
and got the above error

After some tries I also get this debug message:

OW Debug - Exception
Message: There is no such prefix..
File: /xxxxxxx/ow_system_plugins/base/bol/language_value_dao.php
Line: 89
Trace:

#0 /xxxxxx/ow_system_plugins/base/bol/language_service.php(200): BOL_LanguageValueDao->findLastKeyList(0, 20, 'ajaxim2')
#1 /xxxxxx/ow_system_plugins/admin/controllers/languages.php(277): BOL_LanguageService->findLastKeyList(0, 20, 'ajaxim2')
#2 [internal function]: ADMIN_CTRL_Languages->index(Array)
#3 /xxxxxx/ow_core/dispatcher.php(250): ReflectionMethod->invokeArgs(Object(ADMIN_CTRL_Languages), Array)
#4 /xxxxxx/ow_core/application.php(294): OW_Dispatcher->dispatch()
#5 /xxxxxx/index.php(65): OW_Application->dispatch()
#6 {main}

Type: Exception