In Unity 5.5 you're able to make animations of LineRenderer Color, when you change LineRenderer 's colors while in "Keyframe recording mode".
Normally you should not be able to animate LineRenderer 's color.
This animation does not change colors of a LineRenderer. But when it's played it crashes Unity after some time.
Also, such animation might animate the Width, of a LineRenderer. Somehow.

To reproduce:
1. Open attached project.
2. Play "test" scene.
3. It should crash in 1-20 seconds after playing the animation.

Reproduced with: 5.5.0b3, 5.5.0f3
No reproduction: 5.6.0a1

Repro with win7. Previously crashed every time. For some reason now it happens not every time, but most of the times.
No repro with win10.

Fixed in 5.6
Key frames are no longer created, while changing the color of LineRenderer in "Keyframe recording mode".
Loading animation from 5.5 no longer changes the width of LineRenderer.