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-rw-r--r--b4/mbox.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/b4/mbox.py b/b4/mbox.py
index 337875b..de2cfc6 100644
--- a/b4/mbox.py
+++ b/b4/mbox.py
@@ -152,7 +152,7 @@ def make_am(msgs, cmdargs, msgid):
warned = False
for lmsg in lser.patches:
# Only check cover letter or first patch
- if lmsg.counter > 1:
+ if not lmsg or lmsg.counter > 1:
continue
for trailer in list(lmsg.followup_trailers):
if trailer[0].lower() == 'obsoleted-by':