Hide BUC chat frame for specific users role if select Specific Users option

functions.php

<?php
/**
 * Hide BUC chat frame if select Specific Users option.
 *
 * @return void
 */
function buc_hide_chat_frame() {
	if( is_user_logged_in() ) {
		global $venus_buc;
		$settings  = $venus_buc->get_settings();
		$chat_with = isset( $settings['general_general_show_all_users'] ) ? $settings['general_general_show_all_users'] : '';

		if ( 'specific_users' == $chat_with ) {
			$user       = wp_get_current_user();
			$user_roles = ( array ) $user->roles;
			$set_roles  = isset( $settings['general_general_specific_users'] ) ? $settings['general_general_specific_users'] : '';

			if ( is_array( $set_roles ) ) {
				$result = array_intersect( $user_roles, $set_roles );
				if ( empty( $result ) ) {
					echo '<style>#wp-chat-frame {display: none;}</style>';
				}
			}
		}
	}
}
add_action( 'wp_footer', 'buc_hide_chat_frame' );