diff --git a/packages/backend/src/helpers/webhook-handler-sync.js b/packages/backend/src/helpers/webhook-handler-sync.js
index f7c40642..9f33f121 100644
--- a/packages/backend/src/helpers/webhook-handler-sync.js
+++ b/packages/backend/src/helpers/webhook-handler-sync.js
@@ -63,6 +63,8 @@ export default async (flowId, request, response) => {
     });
 
     if (testRun) {
+      response.status(204).end();
+
       // in case of testing, we do not process the whole process.
       continue;
     }
@@ -74,6 +76,12 @@ export default async (flowId, request, response) => {
         executionId,
       });
 
+      if (actionStep.appKey === 'filter' && !actionExecutionStep.dataOut) {
+        response.status(422).end();
+
+        break;
+      }
+
       if (actionStep.key === 'respondWith' && !response.headersSent) {
         const { headers, statusCode, body } = actionExecutionStep.dataOut;