Using the Osticket v1.10 for last 2 years.Issue started from 2 days before. While creating ticket from user page or staff control page, it shows 500 error. Error log from server attached. Please help us to solve. thanks in advance
PHP Fatal error: Uncaught exception 'ObjectNotUnique' with message 'One object was expected; however multiple objects in the database matched the query. In fact, there are 2 matching objects.' in /var/www/html/include/class.orm.php:1176\nStack trace:\n#0 /var/www/html/include/class.orm.php(545): QuerySet->one()\n#1 /var/www/html/include/class.thread.php(2537): VerySimpleModel::lookup(Array)\n#2 /var/www/html/include/class.orm.php(350): ObjectThread::lookup(Array)\n#3 /var/www/html/include/class.orm.php(386): VerySimpleModel->get('thread', NULL)\n#4 /var/www/html/include/class.ticket.php(823): VerySimpleModel->__get('thread')\n#5 /var/www/html/include/class.ticket.php(2593): Ticket->getThread()\n#6 /var/www/html/include/class.ticket.php(3400): Ticket->logEvent('created', NULL, Object(User))\n#7 /var/www/html/include/class.mailfetch.php(796): Ticket::create(Array, Array, 'Email')\n#8 /var/www/html/include/class.mailfetch.php(845): MailFetcher->createTicket(7)\n#9 /var/www/html/include/class.mailfetch.php(925): MailFetcher->fetchEmails()\n# in /var/www/html/include/class.orm.php on line 1176, referer: http://helpdesk/scp/tickets.php?a=open