Title: Fatal Error
Last modified: April 12, 2023

---

# Fatal Error

 *  [Jason M](https://wordpress.org/support/users/ep0ch/)
 * (@ep0ch)
 * [3 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-4424/)
 * error_log is filling up with this nonsense, any pointers on how to fix would 
   be extremely appreciated!
 *     ```wp-block-code
       [12-Apr-2023 14:08:54 UTC] PHP Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class IRPP_License does not have a method "checkLicense" in /wp-includes/class-wp-hook.php:308
   
       Stack trace:
   
       0 /wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
   
       1 /wp-includes/plugin.php(565): WP_Hook->do_action(Array)
   
       2 /wp-cron.php(188): do_action_ref_array('irpp_daily_sche…', Array)
   
       3 {main}
   
       thrown in /wp-includes/class-wp-hook.php on line 308
       ```
   
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-4424%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  [Aaron Robertshaw](https://wordpress.org/support/users/aaronrobertshaw/)
 * (@aaronrobertshaw)
 * [3 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-4424/#post-16650383)
 * Hi [@ep0ch](https://wordpress.org/support/users/ep0ch/)
 * From the error log, a plugin appears to be incorrectly adding a filter somewhere.
   One that is attempting to call the `checkLicense` method in the `IRPP_License`
   class. The error arises due to the class not having the `checkLicense` method.
 * A solution might be as simple as upgrading the relevant plugin if it’s already
   been fixed. To isolate the plugin, I’d temporarily deactivate any licence-related
   plugins one by one until the error logs cease.
 * I hope that helps!

Viewing 1 replies (of 1 total)

The topic ‘Fatal Error’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [Aaron Robertshaw](https://wordpress.org/support/users/aaronrobertshaw/)
 * Last activity: [3 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-4424/#post-16650383)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics