check_ajax_referer failing | WordPress.org

Hi Folks,

within the past week or so, the plugin started failing when clicking “Fulfill Order”. The window would appear to be processing, but never finish. A refresh of the window was required to get anywhere. Using the most recent plugin version 3.6.4

Upon investigation, it appears that another plugin developed in-house is the cause, and the specific line is calling a WordPress function “check_ajax_referer”.

Here is the exact offending line:

check_ajax_referer( ‘create-tracking-item’, ‘security’, true );

Commenting this line out allows the functionality to return.

I’m hoping someone suggest what changes might be required to be able to do this security check.

Thank you!