I am unable to block/reject /.json;%0aa.css

The error I get in dispatcher error.log is

The given path is misformatted or contained invalid characters: Cannot map GET /.json;%0aa.css

Although I am able to block /.json as I dont get any error for this.

I used ;%0aa.css with other URLs but they went ahead without any issue.

So my question is how can I block/reject /.json;%0aa.css as it is printing some output on browser.