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-rw-r--r--src/mailman/model/user.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/mailman/model/user.py b/src/mailman/model/user.py
index 16d5b1a2f..f0048c5f4 100644
--- a/src/mailman/model/user.py
+++ b/src/mailman/model/user.py
@@ -59,7 +59,10 @@ class User(Model):
def __init__(self, real_name=None, preferences=None):
super(User, self).__init__()
self._created_on = date_factory.now()
- self._user_id = uid_factory.new_uid()
+ user_id = uid_factory.new_uid()
+ assert config.db.store.find(User, _user_id=user_id).count() == 0, (
+ 'Duplicate user id {0}'.format(user_id))
+ self._user_id = user_id
self.real_name = ('' if real_name is None else real_name)
self.preferences = preferences
config.db.store.add(self)