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-rw-r--r--b4/mbox.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/b4/mbox.py b/b4/mbox.py
index d40c3df..2391405 100644
--- a/b4/mbox.py
+++ b/b4/mbox.py
@@ -365,6 +365,10 @@ def get_extra_series(mboxfile, direction=1, wantvers=None, nocache=False):
# A patch/series without a cover letter
base_msg = msg
+ if base_msg is None:
+ logger.debug('Could not find cover of 1st patch in mbox')
+ mbx.close()
+ return
# Get subject info from base_msg again
lsub = b4.LoreSubject(base_msg['Subject'])
if not len(lsub.prefixes):