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-rw-r--r--Lib/email/contentmanager.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/email/contentmanager.py b/Lib/email/contentmanager.py
index 2b4b875..b91fb0e 100644
--- a/Lib/email/contentmanager.py
+++ b/Lib/email/contentmanager.py
@@ -146,7 +146,7 @@ def _encode_text(string, charset, cte, policy):
def normal_body(lines): return b'\n'.join(lines) + b'\n'
if cte==None:
# Use heuristics to decide on the "best" encoding.
- if max(len(x) for x in lines) <= policy.max_line_length:
+ if max((len(x) for x in lines), default=0) <= policy.max_line_length:
try:
return '7bit', normal_body(lines).decode('ascii')
except UnicodeDecodeError: