WordPress Errors

How to Fix Fatal Error Uncaught TypeError call_user_func_array in WordPress

June 9, 2026 5 mins read 14 views

The “Fatal error: Uncaught TypeError: call_user_func_array()” error in WordPress is a frustrating issue that can bring your website to a grinding halt. This error typically occurs when there’s a mismatch between the expected and actual arguments passed to a function, often due to a plugin or theme incompatibility. If you’re seeing this error, don’t worry – you’re not alone. In this article, we’ll explore the common causes of this issue and provide step-by-step solutions to help you fix it and get your website up and running smoothly again.

What Causes This Issue

The “Fatal error: Uncaught TypeError: call_user_func_array()” error is usually caused by a mismatch between the expected and actual arguments passed to a function. This can happen due to a variety of reasons, including plugin or theme incompatibilities, outdated code, or incorrect function calls. Some common scenarios that can lead to this error include:

  • Using an outdated plugin or theme that is not compatible with the latest version of WordPress
  • Installing a new plugin or theme that has a compatibility issue with an existing one
  • Modifying the code of a plugin or theme without properly testing it
  • Using a third-party library or framework that is not compatible with WordPress

Step-by-Step Solutions

To fix the “Fatal error: Uncaught TypeError: call_user_func_array()” error, follow these step-by-step solutions:

Step 1: Identify the Source of the Error

The first step is to identify the source of the error. Check the error message to see which plugin or theme is causing the issue. The error message will usually include the name of the plugin or theme and the line number where the error is occurring. For example:

Fatal error: Uncaught TypeError: call_user_func_array() expects parameter 1 to be a valid callback, function 'my_plugin_function' not found or invalid function name in /wp-content/plugins/my-plugin/my-plugin.php on line 123

In this example, the error is occurring in the “my-plugin” plugin, on line 123 of the “my-plugin.php” file.

Step 2: Deactivate the Problematic Plugin or Theme

Once you’ve identified the source of the error, try deactivating the problematic plugin or theme. You can do this by logging into your WordPress dashboard, going to the “Plugins” or “Themes” page, and clicking the “Deactivate” button next to the plugin or theme. If you’re unable to access your dashboard, you can also deactivate the plugin or theme by renaming the plugin or theme folder via FTP or SFTP.

Step 3: Update the Plugin or Theme

If deactivating the plugin or theme doesn’t resolve the issue, try updating it to the latest version. You can do this by logging into your WordPress dashboard, going to the “Plugins” or “Themes” page, and clicking the “Update” button next to the plugin or theme. Make sure to backup your website before updating any plugins or themes.

Step 4: Check for Compatibility Issues

If updating the plugin or theme doesn’t resolve the issue, check for compatibility issues with other plugins or themes. Try deactivating all other plugins and themes, and then reactivate them one by one to see if the error occurs. This will help you identify if there’s a compatibility issue between the plugins or themes.

Step 5: Modify the Code (Advanced)

If none of the above steps resolve the issue, you may need to modify the code of the plugin or theme to fix the error. This requires advanced knowledge of PHP and WordPress development. If you’re not comfortable with coding, it’s recommended to hire a professional developer to help you resolve the issue. For example, if the error is caused by an incorrect function call, you may need to modify the code to use the correct function call. For example:

// Incorrect function call
call_user_func_array('my_plugin_function', $args);

// Correct function call
call_user_func_array(array($this, 'my_plugin_function'), $args);

Prevention Tips

To prevent the “Fatal error: Uncaught TypeError: call_user_func_array()” error from occurring in the future, follow these prevention tips:

  • Regularly update your plugins and themes to ensure you have the latest versions
  • Test your website thoroughly after installing or updating any plugins or themes
  • Avoid using outdated or abandoned plugins or themes
  • Use a reputable and reliable plugin or theme provider
  • Keep your website’s PHP version up to date

By following these prevention tips, you can reduce the risk of encountering the “Fatal error: Uncaught TypeError: call_user_func_array()” error and ensure your website remains stable and secure.

Conclusion

In conclusion, the “Fatal error: Uncaught TypeError: call_user_func_array()” error in WordPress can be a frustrating issue, but it’s often caused by a simple mismatch between the expected and actual arguments passed to a function. By following the step-by-step solutions outlined in this article, you should be able to identify and fix the issue. Remember to always keep your plugins and themes up to date, test your website thoroughly, and use reputable and reliable plugin or theme providers to prevent this error from occurring in the future.

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