Stack trace
#0 src/addons/XENTR/Conversations/XF/Service/Conversation/Creator.php(48): XF::handlePhpError(2, '[E_WARNING] Und...', '/var/www/home...', 48)
#1 src/XF/Service/ValidateAndSavableTrait.php(19): XENTR\Conversations\XF\Service\Conversation\Creator->_validate()
#2 src/XF/Pub/Controller/Conversation.php(323): XF\Service\Conversation\Creator->validate(NULL)
#3 src/XF/Mvc/Dispatcher.php(352): XF\Pub\Controller\Conversation->actionAdd(Object(XF\Mvc\ParameterBag))
#4 src/XF/Mvc/Dispatcher.php(259): XF\Mvc\Dispatcher->dispatchClass('XF:Conversation', 'Add', Object(XF\Mvc\RouteMatch), Object(XF\Pub\Controller\Conversation), NULL)
#5 src/XF/Mvc/Dispatcher.php(115): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(XF\Pub\Controller\Conversation), NULL)
#6 src/XF/Mvc/Dispatcher.php(57): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#7 src/XF/App.php(2487): XF\Mvc\Dispatcher->run()
#8 src/XF.php(524): XF\App->run()
#9 index.php(20): XF::runApp('XF\\Pub\\App')
#10 {main}