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-rw-r--r--synapse/handlers/register.py7
1 files changed, 4 insertions, 3 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index f1bf81ed7d..dd03705279 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -350,9 +350,10 @@ class RegistrationHandler(BaseHandler):
     def _generate_user_id(self, reseed=False):
         if reseed or self._next_generated_user_id is None:
             with (yield self._generate_user_id_linearizer.queue(())):
-                self._next_generated_user_id = (
-                    yield self.store.find_next_generated_user_id_localpart()
-                )
+                if reseed or self._next_generated_user_id is None:
+                    self._next_generated_user_id = (
+                        yield self.store.find_next_generated_user_id_localpart()
+                    )
 
         id = self._next_generated_user_id
         self._next_generated_user_id += 1