[nemetroid]

If I visit with an odd User Agent I get a server error.

https://aboutmybrowser.com/47523742 is an example where I used User Agent Switcher in Firefox with the UA string

    Mozilla/5.0 (compatible; Konqueror/4.5; FreeBSD) KHTML/4.5.4 (like Gecko)

[prateekdayal]

Thanks for reporting this. Only when we started working on this we realized how complex user agent string parsing is. We will be improving it with all the feedback so you can expect things to be better in a day or so.

[rampr]

Offtopic though, You might want to read how user agent strings have evolved - http://webaim.org/blog/user-agent-string-history/