If you have a stack trace where the problem occured then you could be well on the way to locating the source of the problem.
In an ideal world you can fire up a proper debugger ( e.g. Xdebug for PHP ) and put breakpoints into functions/methods in the stack. etc etc.
Many years ago the question would have been “Do you have a dump?”. This dump was a printout that contained a pseudo assembler dump of memory when the program crashed. It often took up a whole box of green line paper. If you couldn’t read assembler then the only useful bit was the stack trace.