Callback custom Gateway module fail

[jazz1611]

Hello,

I'm getting error when return to callback custom file gateway

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exception 'Whoops\Exception\ErrorException' with message 'Call to a member function getLoadedModule() on string' in /home/admin/domains/xxxxxxx/public_html/clients/includes/gatewayfunctions.php:0
Stack trace:
#0 /home/admin/domains/xxxxx/public_html/clients/vendor/whmcs/whmcs-foundation/lib/Utility/Error/Run.php(0): WHMCS\Utility\Error\Run->handleError(1, 'Call to a membe...', '/home/admin/dom...', 0)
#1 [internal function]: WHMCS\Utility\Error\Run->handleShutdown()
#2 {main}

What should i do? If i refresh that current page, it blank page. Not show any error.

Regards,