assign activeMenuItem to view only if it is defined

Classes/Controller/BackendController.php

@@ -73,6 +73,7 @@ class BackendController extends ActionController
                             $queryParams['tx_pagemanager_tools_pagemanagerpgmgt']['daysPast'] == $menuItemConfig['parameters']['daysPast'])) {
                         $isActive = true;
                         $activeMenuItem = $key; // store the key of the active menu item
+                        $view->assign('activeMenuItem', $activeMenuItem);
                     }
                 }
             }
@@ -84,7 +85,7 @@ class BackendController extends ActionController
             $menu->addMenuItem($menuItem);
         }
         $this->moduleTemplate->getDocHeaderComponent()->getMenuRegistry()->addMenu($menu);
-        $view->assign('activeMenuItem', $activeMenuItem);
+//        $view->assign('activeMenuItem', $activeMenuItem);
     }
 
     protected function translate($key, $arguments): string