--- a/hgext3rd/topic/__init__.py	Fri Sep 22 16:41:37 2017 +0200
+++ b/hgext3rd/topic/__init__.py	Fri Sep 22 18:01:29 2017 +0200
@@ -313,7 +313,10 @@
             return peer
 
         def transaction(self, *a, **k):
+            ctr = self.currenttransaction()
             tr = super(topicrepo, self).transaction(*a, **k)
+            if ctr is not None:
+                return tr
 
             reporef = weakref.ref(self)