Error when creating a new status in backend

On a clean install with 1.4.1 and WP 4.9.6 the following warning/error occurs in case you create a new status in the backend:

Warning: Parameter 1 to end() expected to be a reference, value given in /www/htdocs/v151719/mitmachen.adfc-velbert.de/test/wp-content/plugins/improve-my-city/functions/imc-core-taxstatus-ordering.php on line 304

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/v151719/mitmachen.adfc-velbert.de/test/wp-content/plugins/improve-my-city/functions/imc-core-taxstatus-ordering.php:304) in /www/htdocs/v151719/mitmachen.adfc-velbert.de/test/wp-includes/pluggable.php on line 1216

Suggested fix for line 304 in imc-core-taxstatus-ordering.php:

/**
     * Add term last on insertion
     *
     * @param int $term_id
     */
    public function imcstatus_created_term( $term_id, $tt_id, $taxonomy ) {
        if ( ! $this->imcstatus_has_support( $taxonomy ) ) {
            return;
        }

        $terms = get_terms( 'imcstatus', array('hide_empty' => false,) );
        $terms_values = array_values($terms);
        //$lastTerm = call_user_func('end', array_values($terms) );
        $lastTerm = call_user_func_array('end', array(&$terms_values));
        $lastTermID = $lastTerm->term_id;
        $lastTermORDER = get_term_meta ( $lastTermID, 'imc_term_order');

        update_metadata( 'term', $term_id, 'imc_term_order', $lastTermORDER[0]+1 );
    }