error after install

[wgreipl]

after install i run the Chat.

this is the error

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Exception: {"Message":"An exception occurred while executing '\t\t\tINSERT\n\t\t\tINTO oc_chat_och_users_in_conversation\n\t\t\t(\n\t\t\t\tuser,\n\t\t\t\tconversation_id,\n\t\t\t\tjoined\n\t\t\t) VALUES (\n\t\t\t\t?,\n\t\t\t\t?,\n\t\t\t\t?\n\t\t\t)' with params [null, "CONV_ID_1424514520_53", 1424514520]:\n\nSQLSTATE[23000]: Integrity constraint violation: 1048 Column 'user' cannot be null","Code":0,"Trace":"#0 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php(116): Doctrine\DBAL\Driver\AbstractMySQLDriver->convertException('An exception oc...', Object(Doctrine\DBAL\Driver\PDOException))\n#1 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Statement.php(172): Doctrine\DBAL\DBALException::driverExceptionDuringQuery(Object(Doctrine\DBAL\Driver\PDOMySql\Driver), Object(Doctrine\DBAL\Driver\PDOException), '\t\t\tINSSSSERT\n\t\t\t\t\t\t\t\tArray)\n#2 /var/www/owncloud/lib/private/db/statementwrapper.php(65): Doctrine\DBAL\Statement->execute()\n#3 /var/www/owncloud/lib/public/appframework/db/mapper.php(213): OC_DB_StatementWrapper->execute()\n#4 /var/www/owncloud/apps/chat/lib/och/db/usermapper.php(124): OCP\AppFramework\Db\Mapper->execute('\t\t\tINSSSSERT\n\t\t\t\t\t\t\t\tArray)\n#5 /var/www/owncloud/apps/chat/lib/och/commands/join.php(40): OCA\Chat\OCH\Db\UserMapper->insertUnique(Object(OCA\Chat\OCH\Db\User))\n#6 /var/www/owncloud/apps/chat/lib/och/commands/startconv.php(69): OCA\Chat\OCH\Commands\Join->execute()\n#7 /var/www/owncloud/apps/chat/lib/och/och.php(75): OCA\Chat\OCH\Commands\StartConv->execute()\n#8

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i use oc8

[LEDfan]

Are you using user_ldap as user backend in core?

[wgreipl]

yes!

have the Chat a Problem with user_ldap