diff --git a/model/UnsavedRelationList.php b/model/UnsavedRelationList.php
index 1ff8cd970..83d965777 100644
--- a/model/UnsavedRelationList.php
+++ b/model/UnsavedRelationList.php
@@ -55,6 +55,7 @@ class UnsavedRelationList extends ArrayList {
 		$this->baseClass = $baseClass;
 		$this->relationName = $relationName;
 		$this->dataClass = $dataClass;
+		parent::__construct();
 	}
 
 	/**