diff --git a/modules/backend/traits/FormModelSaver.php b/modules/backend/traits/FormModelSaver.php
index 2f33fa7e3..221d900fd 100644
--- a/modules/backend/traits/FormModelSaver.php
+++ b/modules/backend/traits/FormModelSaver.php
@@ -63,7 +63,7 @@ trait FormModelSaver
         }
 
         $attributesToPurge = [];
-        $singularTypes = ['belongsTo', 'hasOne', 'morphOne'];
+        $singularTypes = ['belongsTo', 'hasOne', 'morphTo', 'morphOne'];
 
         foreach ($saveData as $attribute => $value) {
             $isNested = $attribute == 'pivot' || (