diff --git a/tracker/tracker/src/main/app/index.ts b/tracker/tracker/src/main/app/index.ts
index 75e13055e..13499a669 100644
--- a/tracker/tracker/src/main/app/index.ts
+++ b/tracker/tracker/src/main/app/index.ts
@@ -350,8 +350,8 @@ export default class App {
       requestIdleCb(() => {
         this.messages.unshift(TabData(this.session.getTabId()))
         this.messages.unshift(Timestamp(this.timestamp()))
-        // ? why I need to do this?
-        this.worker!.postMessage(this.messages)
+        // why I need to add opt chaining?
+        this.worker?.postMessage(this.messages)
         this.commitCallbacks.forEach((cb) => cb(this.messages))
         this.messages.length = 0
       })