Title: Installing the plugin crashes wordpress
Last modified: September 30, 2018

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# Installing the plugin crashes wordpress

 *  Resolved [dmuenze](https://wordpress.org/support/users/dmuenze/)
 * (@dmuenze)
 * [7 years, 8 months ago](https://wordpress.org/support/topic/installing-the-plugin-crashes-wordpress/)
 * Hey guys,
 * i have a problem with installing the plugin. Whenever i want to install it, i
   get the following fatal error and my whole wordpress admin-page isn’t working
   anymore. I need to delete the folder in the plugins directory to get back to 
   normal.
 * Fatal error: Uncaught NinjaMutex\UnrecoverableMutexException: Cannot release 
   lock in Mutex __destruct(): codeneric_phmm_migration in /var/www/web26647988/
   html/wp-content/plugins/photography-management/vendor/arvenil/ninja-mutex/src/
   NinjaMutex/Mutex.php:100 Stack trace: #0 [internal function]: NinjaMutex\Mutex-
   >__destruct() #1 {main} thrown in /var/www/web26647988/html/wp-content/plugins/
   photography-management/vendor/arvenil/ninja-mutex/src/NinjaMutex/Mutex.php on
   line 100
 * Can you please help me? How can i solve this problem? Is there an update necessary?
   I tried the actual plugin version as well as version 4.1.2
 * Thanks in advance for every help!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Denis Golovin](https://wordpress.org/support/users/denis_golovin/)
 * (@denis_golovin)
 * [7 years, 8 months ago](https://wordpress.org/support/topic/installing-the-plugin-crashes-wordpress/#post-10778728)
 * Hi,
 * thank you for reporting the issue. Which PHP version and which OS is installed
   on your server?
 * The error is related to a module which sets a lock on a file in your wp uploads
   folder (usually wp-content/uploads). Make sure that PHP has sufficient permissions
   to write in this folder.
 *  Thread Starter [dmuenze](https://wordpress.org/support/users/dmuenze/)
 * (@dmuenze)
 * [7 years, 8 months ago](https://wordpress.org/support/topic/installing-the-plugin-crashes-wordpress/#post-10784206)
 * Hi,
 * thank you for your reply! This helped me to find a solution for the problem. 
   In the log files i found additonal errors which lead me to the mysql database.
   
   I previously had the website migrated via duplicator to another server – this
   caused the problem. I had to delete the whole plugin as well as the plugin files
   and folders in the “upload”-folder and then had to search & delete manually via
   phpmyadmin the remaining data from the plugin. It would be an improvement for
   further plugin development, that with de-installation of the plugin the database
   is cleared completely.
 * Thanks again for your help!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Installing the plugin crashes wordpress’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/photography-management_6a6a63.svg)
 * [Photography Management - WordPress Photo Proofing Plugin](https://wordpress.org/plugins/photography-management/)
 * [Support Threads](https://wordpress.org/support/plugin/photography-management/)
 * [Active Topics](https://wordpress.org/support/plugin/photography-management/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/photography-management/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/photography-management/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [dmuenze](https://wordpress.org/support/users/dmuenze/)
 * Last activity: [7 years, 8 months ago](https://wordpress.org/support/topic/installing-the-plugin-crashes-wordpress/#post-10784206)
 * Status: resolved