Selecting a bezier point and clicking "Clear Point" causes errors in the log. The scene will also lock up. To stop the errors the user needs to exit "Edit Bezier Shape" then Ctl+ Z the change.

Steps to reproduce
- Open the attached project in Unity 2018.1.0b13
- In the projects menu select "_Scenes > Models > Goal Side (Or "New Game Object (1))
- In the inspector click "Edit Bezier Shape"
- Select the blue square handle, at the bottom of the shape.
- In the inspector click "Clear Point"
NOTICE ISSUE >> 999+ Errors. The log spew will continue as long as the user is in the Scene view.

Reproducible on : 2018.2.0b3

Image attached
Video Attached

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Fixed in 4.0.0.