FSS return result when Login required enabled

(from github.com/buithehien1991)
Dear @marevol

I found the problem.
I checked on Login required in Genera System setting
I goto FSS and input query text and press Search button. Result of this query still display on page of FSS.
That is correct ?

Thank you and best regards,
Bui The Hien

(from github.com/marevol)
Filed https://github.com/codelibs/fess-site-search/issues/89