Custom functions broken after update

Hello
In a past support ticket I asked how to make it so the first and last name were no longer required. I used the function below and it worked great but now appears to be broken.

function my_custom_prefix_give_modify_required_fields( $required_fields ) {

if ( isset( $required_fields[‘give_first’] ) ) {
unset( $required_fields[‘give_first’] );
}

return $required_fields;

}

add_filter( ‘give_purchase_form_required_fields’, ‘my_custom_prefix_give_modify_required_fields’, 10, 1 );
add_filter( ‘give_donation_form_required_fields’, ‘my_custom_prefix_give_modify_required_fields’, 10, 1 );

https://ww.wp.xz.cn/plugins/give/