Upload the gunz.dmp located in the folder where you installed FGunZ (same folder where the gunz.exe, launcher.exe, etc. are located). Then delete the gunz.dmp file. The next time you crash, check if there is a gunz.dmp again and upload it, too. (that way you can be sure that the gunz.dmp file is always a new one)
We don't know that people crash unless they tell us, and the gunz.dmp file gives us the information we need to fix those crashes.