diff --git a/bilibiliuploader/core.py b/bilibiliuploader/core.py
index f9c0c96..d68de35 100644
--- a/bilibiliuploader/core.py
+++ b/bilibiliuploader/core.py
@@ -628,7 +628,7 @@ def edit_videos(
         tag=None,
         desc=None,
         source=None,
-        cover=None,
+        cover='',
         no_reprint=None,
         open_elec=None,
         max_retry: int = 5,