“Coupon Code Field is Empty” when coupon applied successfully

In include/functions.php:

    $csuccesfully = get_theme_mod( 'coupn_field_empty', 'Coupon Applied Successfully' );

This line should be:

    $csuccesfully = get_theme_mod( 'coupn_code_applied', 'Coupon Applied Successfully' );

This issue happens when get_theme_mod returns the custom value instead of the default value.