diff --git a/radicale/sharing/__init__.py b/radicale/sharing/__init__.py
index cb45c78b..4e1ddd15 100644
--- a/radicale/sharing/__init__.py
+++ b/radicale/sharing/__init__.py
@@ -365,7 +365,7 @@ class BaseSharing:
         else:
             if logger.isEnabledFor(logging.DEBUG):
                 logger.debug("TRACE/sharing/map: not active")
-            return None
+            pass
 
         return None