Steps to reproduce:

1. Open attached project "766891.zip"
2. Open scene "repro"
3. In hierarchy, select "Tree"
4. In tree editor, select left branch (node which has number "7" in the corner)
5. Now open its Distribution curve editor
6. Select second curve preset (looks like "/")
7. Drag right point of the curve to the bottom (0 value)
8. Unity crashes shortly

0x0000000141E389BE (Unity) physx::shdfnd::internal::partition<unsigned int,physx::SortBoundsPredicate const >

Reproduced with: 5.1.4f1, 5.24p1, 5.3.2p1, 5.4.0b4