PopUp Pro: Invalid argument supplied for foreach()

I've had to disable the PopUp Pro plugin on http://arthiveonline.com. The site is on WordPress 4.3, the plugin is Version 4.7.1.0, the theme is the Socha theme. My error log is filling up with the following:

[26-Aug-2015 05:02:00 UTC] PHP Warning: Invalid argument supplied for foreach() in /home/ahoadmin/public_html/wp-content/plugins/popover/inc/class-popup-public.php on line 190

Need help resolving this.