diff --git a/backend/app/Http/Controllers/Api/FatherRelationsController.php b/backend/app/Http/Controllers/Api/FatherRelationsController.php
index 4a8629cc..c40bd98c 100644
--- a/backend/app/Http/Controllers/Api/FatherRelationsController.php
+++ b/backend/app/Http/Controllers/Api/FatherRelationsController.php
@@ -64,7 +64,7 @@ class FatherRelationsController extends Controller {
         }
 
         try {
-            FatherRelation::where('father_id', session()->get('fathers')->id)->where('child_id', $child_id)->delete();
+            FatherRelation::where('father_id', session()->get('fathers')['id'])->where('child_id', $child_id)->delete();
         } catch (\Throwable $e) {
             // 失敗
             Log::critical($e->getMessage());