diff --git a/src/ORM/ArrayList.php b/src/ORM/ArrayList.php
index 83e448b93..c5c478326 100644
--- a/src/ORM/ArrayList.php
+++ b/src/ORM/ArrayList.php
@@ -604,7 +604,7 @@ class ArrayList extends ViewableData implements SS_List, Filterable, Sortable, L
 
         $firstRecord = $this->first();
 
-        return is_array($firstRecord) ? array_key_exists($by, $firstRecord) : property_exists($by, $firstRecord ?? '');
+        return is_array($firstRecord) ? array_key_exists($by, $firstRecord) : property_exists($firstRecord, $by ?? '');
     }
 
     /**