Undefined Indexes on Admin page

When loading the admin settings page I get undefined index warnings.

Changing line 300 of im8-box-hide.php from

if ($wp_meta_boxes[$post_type->name])

to

if (isset($wp_meta_boxes[$post_type->name]) && $wp_meta_boxes[$post_type->name])

Fixes this issue

https://wordpress.org/plugins/im8-box-hide/