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-rw-r--r--sleekxmpp/features/feature_mechanisms/stanza/auth.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sleekxmpp/features/feature_mechanisms/stanza/auth.py b/sleekxmpp/features/feature_mechanisms/stanza/auth.py
index 7b665345..6b6f85a3 100644
--- a/sleekxmpp/features/feature_mechanisms/stanza/auth.py
+++ b/sleekxmpp/features/feature_mechanisms/stanza/auth.py
@@ -40,7 +40,7 @@ class Auth(StanzaBase):
if not self['mechanism'] in self.plain_mechs:
if values:
self.xml.text = bytes(base64.b64encode(values)).decode('utf-8')
- else:
+ elif values == b'':
self.xml.text = '='
else:
self.xml.text = bytes(values).decode('utf-8')