Undefined index: Device_Typ

Notice: Undefined index: Device_Type in /hsphere/local/home/vohnjec/ccssciencefair.com/wordpress2/wp-content/plugins/php-browser-detection/php-browser-detection.php on line 203

I am using WordPress 4.0 and PHP Browser Detection 3.1.1

Usage

if (function_exists('is_mobile')){
    echo is_mobile() ? 'Hello' : '';
}

https://wordpress.org/plugins/php-browser-detection/