[BUGFIX] Call to a member function getAttribute() on null in PolicyMutatedEventListener.php:30 when opening CSP backend module

Author: akoenig-clickstorm

Classes/EventListener/PolicyMutatedEventListener.php

@@ -27,7 +27,7 @@ public function __invoke(PolicyMutatedEvent $event): void
         }
 
         /** @var ?ExtbaseModule $module */
-        $module = $event->request->getAttribute('module');
+        $module = $event->request?->getAttribute('module');
 
         // only for cs_seo web module
         if($module instanceof ExtbaseModule && str_starts_with($module->getIdentifier(), ModuleWebController::$mod_name)) {
@@ -41,4 +41,4 @@ public function __invoke(PolicyMutatedEvent $event): void
             $event->setCurrentPolicy($policy);
         }
     }
-}
+}