BUG on Widget

I fixed this with a simple check.
Line 271.

$url = (isset($instance[‘url’])) ? esc_url($instance[‘url’]) : ”;
$pagetitle = (isset($instance[‘pagetitle’])) ? sc_attr($instance[‘pagetitle’]) : ”;

Without the isset() check, with DEBUG mode on, this throw an error and break the widgets page.

https://wordpress.org/plugins/simple-share-buttons-adder/