Cannot delete or update a parent row: a foreign key constraint fails

[amdkryn]

I created a row "Delete" and moved about 30 tickets for her. I used a task created a few months ago and it has always worked but not working anymore. I try to delete some tickets and the error occurs below, however, Articles and other information are deleted but the ticket is still in the system (only with the subject, type, owner and responsible).

Does anyone know how to solve?

Thu Jan 8 14:42:00 2015 error OTRS-CGI-10 Cannot delete or update a parent row: a foreign key constraint fails (`otrs`.`ticket_index`, CONSTRAINT `FK_ticket_index_ticket_id_id` FOREIGN KEY (`ticket_id`) REFERENCES `ticket` (`id`)), SQL: 'DELETE FROM ticket WHERE id = ?'
Thu Jan 8 14:42:00 2015 notice OTRS-CGI-10 Delete Ticket (1048501/51179).
Thu Jan 8 14:42:00 2015 notice OTRS-CGI-10 Run GenericAgent Job 'Delete Tickets!!!!' from db.

[jojo]

tickets can only be deleted via generic agent

[amdkryn]

Yes, I used only the "Generic agent".

[jojo]

try update to 3.3.11