Title: Fatal error when activating/installing module
Last modified: July 5, 2022

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# Fatal error when activating/installing module

 *  [kipzes](https://wordpress.org/support/users/kipzes/)
 * (@kipzes)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-installing-module/)
 * When installing/activating the Clerk module I’m getting the following error. 
   We’re running PHP 7.4 on this instance.
 * `Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must
   be of type array, bool given in /<website-directory>/app/plugins/clerkio/includes/
   class-clerk-visitor-tracking.php:28 Stack trace: #0 /<website-directory>/app/
   plugins/clerkio/includes/class-clerk-visitor-tracking.php(13): Clerk_Visitor_Tracking-
   >initHooks() #1 /<website-directory>/app/plugins/clerkio/includes/class-clerk-
   visitor-tracking.php(429): Clerk_Visitor_Tracking->__construct() #2 /<website-
   directory>/app/plugins/clerkio/clerk.php(41): require_once('...') #3 /<website-
   directory>/app/plugins/clerkio/clerk.php(23): Clerk->includes() #4 /<website-
   directory>/app/plugins/clerkio/clerk.php(70): Clerk->__construct() #5 /<website-
   directory>/wp/wp-admin/includes/plugin.php(2313): include_once('...') #6 /<website-
   directory>/wp/wp-admin/plugins.php(192): plugin_sandbox_scrape() #7 {main} thrown
   in /<website-directory>/app/plugins/clerkio/includes/class-clerk-visitor-tracking.
   php on line 28`

Viewing 1 replies (of 1 total)

 *  Thread Starter [kipzes](https://wordpress.org/support/users/kipzes/)
 * (@kipzes)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-installing-module/#post-15797361)
 * I think this issue can be ommitted by replacing line 28 in the `class-clerk-visitor-
   tracking.php` file with the following:
 * `$options = get_option('clerk_options') !== false ? get_option('clerk_options'):[];`

Viewing 1 replies (of 1 total)

The topic ‘Fatal error when activating/installing module’ is closed to new replies.

 * ![](https://ps.w.org/clerkio/assets/icon-256x256.png?rev=1654158)
 * [Clerk](https://wordpress.org/plugins/clerkio/)
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 * 1 reply
 * 1 participant
 * Last reply from: [kipzes](https://wordpress.org/support/users/kipzes/)
 * Last activity: [3 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-installing-module/#post-15797361)
 * Status: not resolved