Description:

This crash happens when calling GameObject.Destroy() on an "empty" GameObject that has a VectorLine from the Vectrosity add-in added to it.

To reproduce:

1. Open project.
2. Open scene "CrashScene".
3. Enter Play Mode.
4. Wait a couple of seconds.

Expected results: Game objects are created continuously.
Actual results: Unity crash after a few Destroy calls.

Reproduces with: 5.4.5p2; 5.5.3p3; 5.6.1f1; 5.6.1p1; 2017.2.0a1;