--- a/eric6/WebBrowser/Bookmarks/BookmarksManager.py	Wed Jun 17 17:12:21 2020 +0200
+++ b/eric6/WebBrowser/Bookmarks/BookmarksManager.py	Wed Jun 17 20:18:54 2020 +0200
@@ -296,10 +296,6 @@
         if not self.__loaded:
             return
         
-        assert timestampType in [BookmarkNode.TsAdded,
-                                 BookmarkNode.TsModified,
-                                 BookmarkNode.TsVisited]
-        
         if timestampType == BookmarkNode.TsAdded:
             node.added = timestamp
         elif timestampType == BookmarkNode.TsModified: