diff --git a/sabnzbd/postproc.py b/sabnzbd/postproc.py
index 6d79fa0..53fa3fb 100644
--- a/sabnzbd/postproc.py
+++ b/sabnzbd/postproc.py
@@ -448,7 +448,7 @@ def process_job(nzo):
         ## Remove newzbin bookmark, if any
         if msgid and all_ok:
             Bookmarks.do.del_bookmark(msgid)
-        elif all_ok:
+        elif all_ok and isinstance(url, str):
             sabnzbd.proxy_rm_bookmark(nzo.url)
 
         ## Show final status in history