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-rw-r--r--django/contrib/auth/base_user.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/contrib/auth/base_user.py b/django/contrib/auth/base_user.py
index 357528e19e..a165677f4c 100644
--- a/django/contrib/auth/base_user.py
+++ b/django/contrib/auth/base_user.py
@@ -138,4 +138,4 @@ class AbstractBaseUser(models.Model):
@classmethod
def normalize_username(cls, username):
- return unicodedata.normalize('NFKC', username) if username else username
+ return unicodedata.normalize('NFKC', username) if isinstance(username, str) else username