Widgets error when enabling plugin

When I activate the plugin, a new error shows up in my Widgets. Please see screencap for exact error. It shows up in both the CSP sidebars, and my original sidebar.

Warning: : Missing argument 2 for apply_filters(), called in /home/--(my site)--/wp-content/plugins/custom-sidebars/inc/class-custom-sidebars-visibility.php on line 531 and defined in /home/--(my site)--/wp-includes/plugin.php on line 177.