diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 6d155d57e7940da3706fb7fbb5f04a2a50daf1b2..c5e5b288119458724d36ed5243d946487ca5feb5 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -157,6 +157,7 @@ class RegistrationHandler(BaseHandler):
                     )
                 except SynapseError:
                     # if user id is taken, just generate another
+                    user = None
                     user_id = None
                     token = None
                     attempts += 1