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-rw-r--r--changelog.d/3753.bugfix1
-rw-r--r--synapse/server_notices/resource_limits_server_notices.py4
2 files changed, 5 insertions, 0 deletions
diff --git a/changelog.d/3753.bugfix b/changelog.d/3753.bugfix
new file mode 100644
index 0000000000..b4301267df
--- /dev/null
+++ b/changelog.d/3753.bugfix
@@ -0,0 +1 @@
+Fix bug where we broke sync when using limit_usage_by_mau but hadn't configured server notices
diff --git a/synapse/server_notices/resource_limits_server_notices.py b/synapse/server_notices/resource_limits_server_notices.py
index 96eb97771f..98495ddbf9 100644
--- a/synapse/server_notices/resource_limits_server_notices.py
+++ b/synapse/server_notices/resource_limits_server_notices.py
@@ -66,6 +66,10 @@ class ResourceLimitsServerNotices(object):
         if self._config.limit_usage_by_mau is False:
             return
 
+        if not self._server_notices_manager.is_enabled():
+            # Don't try and send server notices unles they've been enabled
+            return
+
         timestamp = yield self._store.user_last_seen_monthly_active(user_id)
         if timestamp is None:
             # This user will be blocked from receiving the notice anyway.