Generally any GPF should not happen, so it is worth investigating.
The following is a standard answer, since it occurs so frequently
What are KiCad nightly builds?
Nightly builds are not releases, they are test builds. If you use them, you should expect to encounter problems. If you find a reproducible bug that is not already known, please raise it on the bug tracker and provide sufficient detail to investigate the problem. You are not obliged to do this, but it will help improve KiCad for everyone.
Monitor the following sources of information in order to find information about recent changes and known issues:
Recent changes https://git.launchpad.net/kicad/log/?h=master
Recent bug reports https://bugs.launchpad.net/kicad/+bugs?orderby=-id&start=0
Developer discussion https://lists.launchpad.net/kicad-developers/date.html
Unless you absolutely need a feature only found in a nightly build, or wish to participate in advanced testing, you should use a stable release. If you publish projects or footprints created using KiCad, you should use a stable release version as otherwise the project may be unusable by people using the latest stable release.