PHP Warning in AdminNotifications.php

This just started happening this morning for some reason.
Using Zen Cart 1.5.6c PHP version 7.1.8

PHP Warning: array_keys() expects parameter 1 to be array, null given in /usr/home/xxx/public_html/xxx/xxx/includes/classes/AdminNotifications.php on line 149.

Is there something up with the Project Notification server?

I too found this happening this morning although I'm not entirely sure why.

There is a ZC v1.57 change to AdminNotifications.php that seems to do the job:

https://github.com/zencart/zencart/c...16111c4dca5ab8

Thank you for your help. That 1.5.7 update did the trick.