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-rw-r--r--synapse/handlers/register.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 8a7d965feb..885da82985 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -174,7 +174,7 @@ class RegistrationHandler(BaseHandler):
         if password:
             password_hash = yield self._auth_handler.hash(password)
 
-        if localpart:
+        if localpart is not None:
             yield self.check_username(localpart, guest_access_token=guest_access_token)
 
             was_guest = guest_access_token is not None