Error in Arachni::Checks::CodeInjectionPhpInputWrapper: invalid byte sequence in US-ASCII

Created by: arschlochnop

when i csan like this url http://site/?search_button=&s=%E6%90%9C%E7%B4%A2%E4%B8%80%E4%B8%8B igot a error. I feel because there are Unicode characters in URL. this's Chinese characters. /?search_button=&s=搜索一下 Can u help me?