To enable debug set WP_DEBUG and WP_DEBUG_LOG to true in your wp-config.php file:
// Enable WP_DEBUG mode
define( 'WP_DEBUG', true );
// Enable Debug logging to the /wp-content/debug.log file
define( 'WP_DEBUG_LOG', true );
// Disable display of errors and warnings
define( 'WP_DEBUG_DISPLAY', false );
@ini_set( 'display_errors', 0 );
Once you’ve done that – all further errors will be logged in wp-content/debug.log file. Please provide our support agents with this file AFTER you enabled debug and replicated the error.
!! IMPORTANT: Once the issue is fixed – remove these debug settings from wp-config.php
More information about debugging in WordPress can be found by clicking here