diff --git a/lib/core/utils/frame-messenger/message-parser.js b/lib/core/utils/frame-messenger/message-parser.js
index 65aea70f41..c7154f8e38 100644
--- a/lib/core/utils/frame-messenger/message-parser.js
+++ b/lib/core/utils/frame-messenger/message-parser.js
@@ -67,6 +67,7 @@ export function parseMessage(dataString) {
  */
 function isRespondableMessage(postedMessage) {
   return (
+    postedMessage !== null &&
     typeof postedMessage === 'object' &&
     typeof postedMessage.channelId === 'string' &&
     postedMessage.source === getSource()