DLL Crash

My application consists of one exe and one DLL there is one function in DLL which exe calls during execution I have written error handling code in DLL(On error goto ). Code works fine in debug mode (it jumps to error handler and show appropriate error message "Automation error" error code: 2147417851) but whenever I build and try to run the application it crashes with no error message . I just wanted to know why my application is getting crashed when i have written error handling code in it? Is there any way so that I can stop my app from crashing?

How do you use your dll and what your error handler looks like? You should also have err handler in your main app, btw.