Run time error bypass to source code

My sheet uses a lot of VBA. I just realized that someone could force a run time error if the xls sheet is not bug proof, and go directly to the source code of an EXE application.

I'm relatively new to programming, but any ideas on how I can enhance protection to the source code?

To prevent this, you can use the two VBA protection features of XLS Padlock: Lock VBA project and Prevent access to the VBE.
Or even better, use our integrated VBA compiler to secure portions of your VBA code.