Steps to reproduce:
1. Open attached project
2. Try to build for Windows standalone
-Crash

Result: On build IPreprocessBuild.OnPreprocessBuild will be called and it will try to call BuildAssetBundles() which will result in a crash

Reproduced on: 5.6.1f1, 2017.1.0f3, 2017.2.0b2

Fixed in: 2017.3.0a
Instead of crashing, throws an error/warning while building (which is expected behaviour):
InvalidOperationException: Building AssetBundles while building player is not allowed, if you need to build bundles as part of a build, create a custom build script.