[phpBB Debug] PHP Warning: in file [ROOT]/ext/martin/cssmagic/event/listener.php on line 597: Undefined property: martin/cssmagic/event/listener::$extension_manager

Fatal error: Uncaught Error: Call to a member function create_extension_metadata_manager() on null in /home/tom/public_html/ext/martin/cssmagic/event/listener.php:597 Stack trace: #0 /home/tom/public_html/ext/martin/cssmagic/event/listener.php(520): martin\cssmagic\event\listener->assign_authors() #1 /home/tom/public_html/vendor/symfony/event-dispatcher/EventDispatcher.php(214): martin\cssmagic\event\listener->page_header() #2 /home/tom/public_html/vendor/symfony/event-dispatcher/EventDispatcher.php(44): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch() #3 /home/tom/public_html/phpbb/event/dispatcher.php(62): Symfony\Component\EventDispatcher\EventDispatcher->dispatch() #4 /home/tom/public_html/phpbb/event/dispatcher.php(46): phpbb\event\dispatcher->dispatch() #5 /home/tom/public_html/includes/functions.php(3818): phpbb\event\dispatcher->trigger_event() #6 /home/tom/public_html/phpbb/event/kernel_exception_subscriber.php(107): page_header() #7 /home/tom/public_html/vendor/symfony/event-dispatcher/EventDispatcher.php(214): phpbb\event\kernel_exception_subscriber->on_kernel_exception() #8 /home/tom/public_html/vendor/symfony/event-dispatcher/EventDispatcher.php(44): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch() #9 /home/tom/public_html/phpbb/event/dispatcher.php(62): Symfony\Component\EventDispatcher\EventDispatcher->dispatch() #10 /home/tom/public_html/vendor/symfony/http-kernel/HttpKernel.php(227): phpbb\event\dispatcher->dispatch() #11 /home/tom/public_html/vendor/symfony/http-kernel/HttpKernel.php(79): Symfony\Component\HttpKernel\HttpKernel->handleException() #12 /home/tom/public_html/app.php(35): Symfony\Component\HttpKernel\HttpKernel->handle() #13 {main} thrown in /home/tom/public_html/ext/martin/cssmagic/event/listener.php on line 597