Undefined offset line 106

Hello,

I noticed that my debug.log suddenly grew 5mb the other day. The recurring theme is:

PHP Notice: Undefined offset: 1 in /var/www/vhosts/my-site/wp-content/plugins/advanced-browser-check/abc-core.php on line 106

That code is:

$version = $matches['version'][1];

If this is not an issue with the plugin, can you suggest another possibility?

Thank you

https://www.ads-software.com/plugins/advanced-browser-check/