This can happen when there's a synchronization issue between marks-git
and marks-hg; a key is missing in marks-hg, and when we receive a reset
command the value of ctx basically comes from None.

Signed-off-by: Felipe Contreras <>
--- | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ b/
index 8aca6dd..1972f7f 100755
--- a/
+++ b/
@@ -917,6 +917,11 @@ def checkheads_bmark(repo, ref, ctx):
     ctx_old = bmarks[bmark]
     ctx_new = ctx
+    if not ctx.rev():
+        print "error %s unknown" % ref
+        return False
     if not repo.changelog.descendant(ctx_old.rev(), ctx_new.rev()):
         if force_push:
             print "ok %s forced update" % ref

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