[SOLVED] SIGSEGV Error in TZQuery.Open command lazarus / 16-Databases ---------------------------------------------------------------------- ramonzitos · 2012-02-22 15:46 I have a application that need to connect and run a SELECT statement in a thread, because it manages lots of lines. But when i use the Open command of my TZQuery, it raises a SIGSEGV Error. It has a Firebird 2.1 connection (the database is Firebird 1.5), and a TZQuery called fbqry. Code: [Select]with fbqry do begin   Close;   SQL.Clear;   SQL.Add('SELECT prodescricao, procodoriginal, proqtdatual, custofinal FROM fmaprodutos');   Open; // Here it raises the SIGSERV Error Sorry for the English. ---------------------------------------------------------------------- ramonzitos · 2012-02-22 21:50 Solved. I needed install the Firebird 1.5 SuperServer.