[Koha] KOha errro Z3950 Search

[Sergio R Poltronieri]

Hello. I am trying search z3950 ,but returns no results. At errorlog 
apche we get the message

DBD::mysql::st execute failed: You have an error in your SQL syntax.  
Check the manual that corresponds to your MySQL server version for the 
right syntax to use near '' at line 1 at 
/usr/local/koha/intranet/modules/C4/Breeding.pm line 168.
DBD::mysql::st fetchrow_hashref failed: fetch() without execute() at 
/usr/local/koha/intranet/modules/C4/Breeding.pm line 169.
query=Select id,file,isbn,title,author from marc_breeding where  title= 
isbn= at /usr/local/koha/intranet/modules/C4/Breeding.pm line 167

Who could help me..
Thanks.


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