diff -r 51f10e6d66c7 -r e2697acd9381 hgext/histedit.py
--- a/hgext/histedit.py	Tue Oct 02 12:43:54 2018 -0700
+++ b/hgext/histedit.py	Wed Oct 03 10:27:44 2018 -0700
@@ -910,7 +910,7 @@
     if not outgoing.missing:
         raise error.Abort(_('no outgoing ancestors'))
     roots = list(repo.revs("roots(%ln)", outgoing.missing))
-    if 1 < len(roots):
+    if len(roots) > 1:
         msg = _('there are ambiguous outgoing revisions')
         hint = _("see 'hg help histedit' for more detail")
         raise error.Abort(msg, hint=hint)