Software⏱️ 3 min read📅 2026-06-03

How to Fix: How to fix 'Unchecked runtime.lastError: The message port closed before a response was received' chrome issue? on console

Unchecked runtime.lastError: The message port closed before a response was received in Chrome, VueJS and Laravel project.

Quick Answer: Check for any WebSocket or WebRTC-related issues in your code, as this error is often related to unhandled promise rejections or closing of message ports.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

The error 'Unchecked runtime.lastError: The message port closed before a response was received' is a common issue in Chrome browser, particularly when using VueJS and Laravel for web development. This error occurs when there is a problem with the communication between the client-side JavaScript code and the server-side API.

This error can be frustrating because it prevents the application from functioning properly, causing unexpected behavior and errors. However, after analyzing the issue further, we have identified potential causes and provided a step-by-step guide to fix this problem.

⚠️ Common Causes

  • The primary reason for this error is related to the way Chrome handles WebSockets. When using WebSockets, the browser establishes a connection with the server, but if the server closes the connection before sending a response, the client-side JavaScript code receives an incomplete or empty response, triggering the 'message port closed' error.
  • Another possible cause of this issue is related to CORS (Cross-Origin Resource Sharing) policies. If the server's CORS policy is not properly configured, it may block the WebSocket connection, resulting in the 'message port closed' error.

🚀 How to Resolve This Issue

Enabling Experimental WebSockets

  1. Step 1: Open Chrome browser and navigate to chrome://flags/#experimental-websockets. Enable the Experimental WebSockets flag.
  2. Step 2: Restart Chrome browser to apply the changes.
  3. Step 3: Verify that the error is resolved by running your application again.

Configuring CORS Policies

  1. Step 1: Check the server-side code to ensure that CORS policies are properly configured. This may involve adding specific headers or modifying existing configurations.
  2. Step 2: Test the application with a tool like curl or Postman to verify that CORS is enabled correctly.

🎯 Final Words

To fix the 'Unchecked runtime.lastError: The message port closed before a response was received' issue in Chrome browser, you can try enabling Experimental WebSockets or configuring CORS policies. By following these steps, you should be able to resolve the error and get your application working properly again.

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