diff --git a/app/enterprise/model/Message.php b/app/enterprise/model/Message.php
index 9bcb2bb..2791b8b 100644
--- a/app/enterprise/model/Message.php
+++ b/app/enterprise/model/Message.php
@@ -430,6 +430,6 @@ class Message extends BaseModel
         foreach ($file_id_arr as $file_id) {
             File::syncDelFile($file_id);
         }
-        $model->where('is_group',0)->force()->delete();
+        $model->where('is_group',$is_group)->force()->delete();
     }
 }
\ No newline at end of file