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-rw-r--r--Lib/email/header.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/email/header.py b/Lib/email/header.py
index 7b30a03..4ab0032 100644
--- a/Lib/email/header.py
+++ b/Lib/email/header.py
@@ -431,7 +431,7 @@ class _ValueFormatter:
if end_of_line != (' ', ''):
self._current_line.push(*end_of_line)
if len(self._current_line) > 0:
- if self._current_line.is_onlyws():
+ if self._current_line.is_onlyws() and self._lines:
self._lines[-1] += str(self._current_line)
else:
self._lines.append(str(self._current_line))