Fixing WordPress Block Editor Errors

Introduction

The WordPress Block Editor is a robust platform, but users frequently encounter errors like crashes, “Invalid JSON,” and publishing failures. This guide create by Premium Blocks team offers step-by-step solutions to fix these problems, along with prevention tips to avoid them in the future.

Issue 1: Block Editor Not Loading or Crashing

This error can be caused by plugin conflicts, outdated software, or limited server resources.

1. Identify Plugin Conflicts

Deactivate all plugins via Plugins > Installed Plugins, then reactivate them one at a time to isolate the problematic plugin.
Common causes include caching or optimization plugins like WP Super Cache or Autoptimize.
Replace conflicting plugins with alternatives like WP Rocket or Perfmatters.

2. Update Software

Regularly update WordPress core, plugins, and themes to their latest versions under Dashboard > Updates.

WordPress dashboard updates for themes and plugins. — WordPress Dashboard Updates

Use tools like Easy Updates Manager to automate updates while avoiding accidental downtimes.

3. Increase WordPress memory limit

Edit the wp-config.php file and add the lines below before the line that says, “Happy publishing.”

set_time_limit(300);
define('WP_MEMORY_LIMIT', '300M');

Edit the php.ini file or request your hosting provider to increase memory limits:

memory_limit = 256M
max_execution_time = 300
upload_max_filesize = 64M

For shared hosting plans, consider upgrading to a managed WordPress host for better performance.

Change the .htaccess file: You can try making changes to your .htaccess file if you can’t get to PHP.ini

php_value memory_limit 512M
php_value max_execution_time 300

Issue 2: Invalid JSON Error

This error occurs when the server fails to communicate properly with the WordPress REST API.

Solution

Ensure URL Consistency: In Settings > General, verify that both the WordPress address and site address use the same protocol (HTTP or HTTPS).

The URL of the WordPress website is provided. — WordPress website URL

Regenerate .htaccess File: Go to Settings > Permalinks and click “Save Changes.” If using custom permalinks, reset them to the default option, test, and switch back.
Use a Debugging Plugin: Install Query Monitor to identify REST API errors and their root causes.
Firewall Configuration: Ask your hosting provider to whitelist REST API routes if you’re behind a firewall or using Cloudflare.

Prevention Tip

Enable logging to track server errors by adding define('WP_DEBUG', true); and define('WP_DEBUG_LOG', true); in the wp-config.php file.

Issue 3: Updating or Publishing Failed

Publishing failures are often linked to server issues or security plugins blocking REST API calls.

Solution

Diagnose REST API Status: Navigate to Tools > Site Health to check for REST API or loopback issues. Resolve any critical errors flagged.

Optimize the Database: Use plugins like WP-Optimize to clean up your database and remove orphaned data.
Temporarily Disable Security Plugins: Deactivate plugins like Wordfence or Sucuri to see if they’re blocking API calls.
Increase Server Resources: Set up object caching using tools like Redis Cache to handle large posts or complex queries.

Prevention Tip

Regularly test publishing functionality after updates by creating a test post in a staging environment.

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Fixing WordPress Block Editor Errors: Crashes, JSON, and Publishing Issues

Table Of Content

Introduction

Issue 1: Block Editor Not Loading or Crashing

1. Identify Plugin Conflicts

2. Update Software

3. Increase WordPress memory limit

Issue 2: Invalid JSON Error

Solution

Prevention Tip

Issue 3: Updating or Publishing Failed

Solution

Prevention Tip

Need Further Help?