Fix None guard in config.server.is_threepid_reserved

1 files changed, 3 insertions, 1 deletions

diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py

index 14025cd219..3ab253462b 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -416,7 +416,9 @@ class RegisterRestServlet(RestServlet):
             )
             # Necessary due to auth checks prior to the threepid being
             # written to the db
-            if is_threepid_reserved(self.hs.config, threepid):
+            if is_threepid_reserved(
+                self.hs.config.mau_limits_reserved_threepids, threepid
+            ):
                 yield self.store.upsert_monthly_active_user(registered_user_id)
 
             # remember that we've now registered that user account, and with