1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/appservice/__init__.py b/synapse/appservice/__init__.py
index 4a6cdbc2be..ab0a6955f0 100644
--- a/synapse/appservice/__init__.py
+++ b/synapse/appservice/__init__.py
@@ -95,7 +95,7 @@ class ApplicationService(object):
         #   rooms: [ {regex: "[A-z]+.*", exclusive: true}, ...],
         # }
         if not namespaces:
-            return None
+            namespaces = {}
 
         for ns in ApplicationService.NS_LIST:
             if ns not in namespaces: