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-rw-r--r--b4/diff.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/b4/diff.py b/b4/diff.py
index 81e015a..10f3159 100644
--- a/b4/diff.py
+++ b/b4/diff.py
@@ -101,6 +101,9 @@ def diff_mboxes(cmdargs):
lmbx = b4.LoreMailbox()
for key, msg in mbx.items():
lmbx.add_message(msg)
+ if len(lmbx.series) < 1:
+ logger.critical('No valid patches found in %s', mboxfile)
+ sys.exit(1)
if len(lmbx.series) > 1:
logger.critical('More than one series version in %s, will use latest', mboxfile)