If you start the emulator in debug mode, from withing your IDE (which one do you use? carbide?)

Then you start the debugger and should be able to put break points by clicking on some line in your code close to where you suspect the problem is, and then use a key to step through each line of code until you find it.

You should be able to put them there even before you start your app (if it crashes at once), or the debugger sucks

For each line you should also be able to see values in relevant variables, to see if anything looks weird.