diff --git a/app/Model/UserRelationBind.php b/app/Model/UserRelationBind.php
index 1265197..f14f029 100644
--- a/app/Model/UserRelationBind.php
+++ b/app/Model/UserRelationBind.php
@@ -28,7 +28,7 @@ class UserRelationBind extends Model
 
     public function setJsonDataAttribute($value)
     {
-        $this->attributes['json_data'] = json_encode(json_decode($value, true));
+        $this->attributes['json_data'] = $value ? json_encode(json_decode($value, true)) : '';
     }
 
 }
\ No newline at end of file