--- a/hgext3rd/topic/__init__.py	Thu Apr 18 11:13:14 2019 +0200
+++ b/hgext3rd/topic/__init__.py	Thu Apr 18 11:13:24 2019 +0200
@@ -1122,6 +1122,8 @@
     return topicmode
 
 def commitwrap(orig, ui, repo, *args, **opts):
+    if not hastopicext(repo):
+        return orig(ui, repo, *args, **opts)
     with repo.wlock():
         topicmode = _configtopicmode(ui)
         ismergecommit = len(repo[None].parents()) == 2