[Koha] Authority search - not returning result

Dear community! In our 3.12.03 version authority search - not returning result : <http://opac.flib.sci.am/cgi-bin/koha/opac-detail.pl?biblionumber=6969&query _desc=an%2Cphr%3A%205297> http://opac.flib.sci.am/cgi-bin/koha/opac-detail.pl?biblionumber=6969&query_ desc=an%2Cphr%3A%205297 An error has occurred when click the Search symbols <http://opac.flib.sci.am/cgi-bin/koha/errors/404.pl> http://opac.flib.sci.am/cgi-bin/koha/errors/404.pl <http://opac.flib.sci.am/cgi-bin/koha/errors/404.pl> opac-authoritiesdetail.pl script doesn't show an authority in MARC format and brings authid in such " " quotes Can anybody help us? Thanks!