[3.3.x] Support Forum • Invalid Host symfony

Code:

PHP Fatal error:  Uncaught Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException: Invalid Host "SITENAME.com: hostheader3.hit093076121616b40.group.bxss.me". in /home/USERNAME/SITENAME.com/vendor/symfony/http-foundation/Request.php:1296Stack trace:#0 /home/USERNAME/SITENAME.com/vendor/symfony/routing/RequestContext.php(68): Symfony\Component\HttpFoundation\Request->getHost()#1 /home/USERNAME/SITENAME.com/phpbb/routing/helper.php(105): Symfony\Component\Routing\RequestContext->fromRequest(Object(phpbb\symfony_request))#2 /home/USERNAME/SITENAME.com/phpbb/controller/helper.php(212): phpbb\routing\helper->route('phpbb_collapsib...', Array, true, false, 1)#3 /home/USERNAME/SITENAME.com/ext/phpbb/collapsiblecategories/operator/operator.php(80): phpbb\controller\helper->route('phpbb_collapsib...', Array)#4 /home/USERNAME/SITENAME.com/ext/phpbb/collapsiblecategories/event/listener.php(80): phpbb\collapsiblecategories\operator\operator->get_collapsible_link('fid_2')#5 /home/USERNAME/SITENAME.com/vendor/symfony/event-dispatcher/EventDispatcher.php(214): phpbb\collapsiblecategories\event\listener->show_collapsible_categories(Object(phpbb\event\data), 'core.display_fo...', Object(phpbb\event\dispatcher))#6 /home/USERNAME/SITENAME.com/vendor/symfony/event-dispatcher/EventDispatcher.php(44): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'core.display_fo...', Object(phpbb\event\data))#7 /home/USERNAME/SITENAME.com/phpbb/event/dispatcher.php(62): Symfony\Component\EventDispatcher\EventDispatcher->dispatch('core.display_fo...', Object(phpbb\event\data))#8 /home/USERNAME/SITENAME.com/phpbb/event/dispatcher.php(46): phpbb\event\dispatcher->dispatch('core.display_fo...', Object(phpbb\event\data))#9 /home/USERNAME/SITENAME.com/includes/functions_display.php(659): phpbb\event\dispatcher->trigger_event('core.display_fo...', Array)#10 /home/USERNAME/SITENAME.com/index.php(87): display_forums(Array, '1')#11 {main}  thrown in /home/USERNAME/SITENAME.com/vendor/symfony/http-foundation/Request.php on line 1296