WooCommerce Product Enquiry Form send enquiry to vendor

woocommerce_product_enquiry_vendor.php

<?php
add_filter( 'product_enquiry_send_to', 'wc_product_enquiry_to_vendor', 10, 2 );
function wc_product_enquiry_to_vendor( $email, $product_id ) {
  	$vendors = get_product_vendors( $product_id );
	if ( ! empty( $vendors ) ) {
		$emails = array();
		foreach( $vendors as $vendor ) {
			foreach( $vendor->admins as $admin ) {
				$emails[] = $admin->data->user_email;
			}
		}
		return $emails;
	}
	return $email;
}
?>

Hello,
I'm getting the following error when adding this snippet on my website:

PHP Fatal error: Call to undefined function get_product_vendors()

Apparently this does not work anymore?

Thank you in advance,
Arky

EDIT: Disregard my comment. A misplaced brace made the function a nested function in my functions.php file. Thanks!