--- a/hgext3rd/topic/topicmap.py	Fri Oct 19 09:02:35 2018 -0700
+++ b/hgext3rd/topic/topicmap.py	Sun Oct 21 00:08:27 2018 +0300
@@ -203,7 +203,7 @@
         unfi = repo.unfiltered()
         oldgetbranchinfo = unfi.revbranchcache().branchinfo
 
-        def branchinfo(r):
+        def branchinfo(r, changelog=None):
             info = oldgetbranchinfo(r)
             topic = ''
             ctx = unfi[r]