Segmentation fault (11) with PHP ODBC

Hi I'm having a little problem ondestanding whats going on.... The problem is that some and only some of my odbc_exec()'s functions while others don't and cause an segmentation fault in apache1/2 My configuration is SuSE 8.1 with Apache2.0.44, PHP4.3.1 --with-iODBC after that i've added FreeTDS 0.61 as ODBC-driver for MS-SQL2K, now this works fine some of the way but not always Exampel: odbc_exec($conn,"select id,name from $user_db.dbo.users"); // Works fine no problem odbc_exec($conn,"select * from $user_db.dbo.users where (id = '$idz')"); // Does not work and causes seg fault (11) Can anyone maby help me explain this error Regards Tommy