Error Logs Filling With Multisite Privacy Plugin Errors

Hello,

Our error logs keep filling with this error:

[07-Sep-2014 20:08:31 UTC] PHP Notice: Undefined index: HTTP_USER_AGENT in /home/soobabiz/public_html/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 151
[07-Sep-2014 20:08:31 UTC] PHP Notice: Undefined index: HTTP_USER_AGENT in /home/soobabiz/public_html/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 155
[07-Sep-2014 20:08:31 UTC] PHP Notice: Undefined index: HTTP_USER_AGENT in /home/soobabiz/public_html/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 159
[07-Sep-2014 20:08:31 UTC] PHP Notice: Undefined index: HTTP_USER_AGENT in /home/soobabiz/public_html/wp-content/plugins/sitewide-privacy-options/sitewide-privacy-options.php on line 163

What needs to be done?

Thanks,
Phil D