1 - On which kind of platform do you work ? Windows, MacOS, Linux ? 32 or 64 bits ?
2 - And which version of this platform it is ?
3 - Is it possible for you to send us your project file (*.kpt) ? With this file (without the images) we can see what your tour contain (how many panoramas, sounds, videos, spots, etc...) .
4 - If you are on Windows, is it possible for you to send us the 3 temporary crash files generated during the crash ? To find those files wait for the crash window, click on "details". The window that will appear lists 3 paths to those 3 temporary files.
5 - Does the crash occurs while the tour is being generated, or directly after you click on the "Build" button ? Or at another specific moment ?