Undefined array key “cat” and “tag”

Hello!

I recently updated the PHP version of my client’s site and am now getting the below errors above each Recent Posts Extended widget.

Warning: Undefined array key “cat” in /home/customer/www/(removed)/public_html/wp-content/plugins/recent-posts-widget-extended/classes/class-rpwe-widget.php on line 176

Warning: Undefined array key “tag” in /home/customer/www/(removed)/public_html/wp-content/plugins/recent-posts-widget-extended/classes/class-rpwe-widget.php on line 177

I have edited the plugin file to comment out these lines (shown below) and this temporarily resolves the problem, but I wondered if you had a more long term fix for if I need to update the plugin?

//$instance[‘cat’]?????????????=?$new_instance[‘cat’];
//$instance[‘tag’]?????????????=?$new_instance[‘tag’];

I have cleared the caching plugin several times before trying this and the issue was not resolved.

Thank you ??