diff --git a/src/ORM/RelatedData/StandardRelatedDataService.php b/src/ORM/RelatedData/StandardRelatedDataService.php
index 2c3eab624..04501fc23 100644
--- a/src/ORM/RelatedData/StandardRelatedDataService.php
+++ b/src/ORM/RelatedData/StandardRelatedDataService.php
@@ -162,7 +162,7 @@ class StandardRelatedDataService implements RelatedDataService
                 $tableName = $this->dataObjectSchema->tableName($candidateClass);
                 break;
             }
-            $candidateClass = get_parent_class($class ?? '');
+            $candidateClass = get_parent_class($candidateClass ?? '');
         }
         return $tableName;
     }