Bug in search-API?

Hello,

I think I found a bug in the API:
The call
https://api2-eu-west-1.insided.com/search?q=searchterm
returns me a json with search results.

The call with the search word "performance" returns an html page Error 502 - Bad Gateway:
https://api2-eu-west-1.insided.com/search?q=performance

I would also like to be able to search for the word "performance".