diff --git a/src/workerHelpers.no-bundler.js b/src/workerHelpers.no-bundler.js
index 8b84a14..231e5c5 100644
--- a/src/workerHelpers.no-bundler.js
+++ b/src/workerHelpers.no-bundler.js
@@ -17,7 +17,7 @@
 function waitForMsgType(target, type) {
   return new Promise(resolve => {
     target.addEventListener('message', function onMsg({ data }) {
-      if (data == null || data.type !== type) return;
+      if (data?.type !== type) return;
       target.removeEventListener('message', onMsg);
       resolve(data);
     });