diff --git a/src/EventListener/AuditListener.php b/src/EventListener/AuditListener.php
index ef372d9..1eff1de 100644
--- a/src/EventListener/AuditListener.php
+++ b/src/EventListener/AuditListener.php
@@ -176,6 +176,9 @@ public function onFlush(OnFlushEventArgs $args): void
                 continue;
             }
             $mapping = $collection->getMapping();
+            if (!is_array($mapping)) {
+                $mapping = $mapping->toArray();
+            }
             if (!$mapping['isOwningSide'] || $mapping['type'] !== ClassMetadata::MANY_TO_MANY) {
                 continue; // ignore inverse side or one to many relations
             }