Saving widget produces error Warning: Illegal string offset 'title' on on line 152

class Wptreehouse_Badges_Widget extends WP_Widget {

    function wptreehouse_badges_widget() {
        // Instantiate the parent object
        parent::__construct( false, 'Treehouse Badges Widget' );
    }

    function widget( $args, $instance ) {
        // Widget output

        extract( $args );
        $title = apply_filters( 'widget_title', $instance['title'] );

        $options = get_option( 'wptreehouse_badges' );
        $wptreehouse_profile = $options['wptreehouse_profile'];

        require( 'inc/view-front-end.php' );

    }

    function update( $new_instance, $old_instance ) {
        // Save widget options

        $instance = $old_instance;
        $instance['title'] = strip_tags( $new_instance['title'] );

        return $instance;
    }

    function form( $instance ) {
        // Output admin widget options form

        $title = esc_attr( $instance['title'] );

        require( 'inc/view-widget-fields.php' );

    }
}

function wptreehouse_register_widget() {
    register_widget( 'Wptreehouse_Badges_Widget' );
}

add_action( 'widgets_init', 'wptreehouse_register_widget' );