Genesis Style Selector causes PHP warning [closed]

This should remove the warning

$selector = get_theme_support( 'genesis-style-selector' );
$wp_customize->add_control(
    'genesis_color_scheme',
    array(
        'label'    => __( 'Select Color Style', 'genesis'),
        'section'  => 'genesis_color_scheme',
        'settings' => $this->get_field_name( 'style_selection' ),
        'type'     => 'select',
        'choices'  => array_merge(
            array( '' => __( 'Default', 'genesis' ) ),
            array_shift( $selector )
        ),
    )
);