diff --git a/src/Controller/Backend/ContentEditController.php b/src/Controller/Backend/ContentEditController.php
index 5041d41f..a960dd47 100644
--- a/src/Controller/Backend/ContentEditController.php
+++ b/src/Controller/Backend/ContentEditController.php
@@ -630,7 +630,11 @@ class ContentEditController extends TwigAwareController implements BackendZoneIn
             ) {
                 $currentRelation->getFromContent()->removeRelationsFromThisContent($currentRelation);
             }
-            $currentRelations = $currentRelations->filter(fn(Relation $r) => $r !== $currentRelation);
+            $currentRelations = $currentRelations->filter(
+                static function (Relation $r) use ($currentRelation) {
+                    return $r !== $currentRelation;
+                }
+            );
             $this->em->remove($currentRelation);
         }