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-rw-r--r--mailman/rules/administrivia.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mailman/rules/administrivia.py b/mailman/rules/administrivia.py
index 4de4fc61a..26fe1d9b8 100644
--- a/mailman/rules/administrivia.py
+++ b/mailman/rules/administrivia.py
@@ -64,7 +64,7 @@ class Administrivia:
return False
# First check the Subject text.
lines_to_check = []
- subject = msg.get('subject', '')
+ subject = str(msg.get('subject', ''))
if subject <> '':
lines_to_check.append(subject)
# Search only the first text/plain subpart of the message. There's