Warning: Undefined variable $Errors_Msg

There is an issue in back-end (plugin settings page):

Warning: Undefined variable $Errors_Msg in C:\OSPanel\domains\site1\wp-content\plugins\decimal-product-quantity-for-woocommerce\includes\options.php on line 138

another issue is (impossible to save with empty value):

Warning!

• Max Quantity () – Not a Valid Number. Set = empty

Check this Settings.

Despite the first issue is appear there is no problem on front-end and evrything works fine.

Use WP and WC of the latest versions (6.2 and 7.6.1)