diff --git a/sentry_sdk/integrations/grpc/aio/server.py b/sentry_sdk/integrations/grpc/aio/server.py
index 5bdd267aba..c87b42670b 100644
--- a/sentry_sdk/integrations/grpc/aio/server.py
+++ b/sentry_sdk/integrations/grpc/aio/server.py
@@ -30,7 +30,7 @@ async def intercept_service(self, continuation, handler_call_details):
         self._handler_call_details = handler_call_details
         handler = await continuation(handler_call_details)
         if handler is None:
-            return
+            return None
 
         if not handler.request_streaming and not handler.response_streaming:
             handler_factory = grpc.unary_unary_rpc_method_handler