Undefined array key

Hi we’re seeing the following errors in the plugin options screen below the checkboxes for custom css and conditional css.

Below custom css:
Warning: Undefined array key “use_custom” in \wp-content\plugins\multi-column-tag-map\mctagmap-options.php on line 150

Below conditional css:
Warning: Undefined array key “use_conditional” in \wp-content\plugins\multi-column-tag-map\mctagmap-options.php on line 179

Both issues resolve if we add some custom and conditional css, tick the boxes and save.

However, if either box is left blank or unticked, the issue remains.

Our server is using PHP8.1 and we’ve tested with 2020 theme and no plugins.

It’s not desperately serious, but it does output an error to the server log file every time it’s encountered.