With default value and taking a Sphere or Torus shape.

1. Create one of these objects via the New Shape PB tool
2. Enter in Edge selection mode
3. Region select edges on the object or all of them
4. Browse for the Bevel tool in PB Window and press the button

Result: a NullReferenceException is generated in the console
Expected: The Bevel action is still computed and shows on the object

Note:
This seems to be caused by a too high value of Bevel here the value will actually makes edges intersect each other once computed.

In the case of the Torus shape, the exception will log in the console and we'll lose the material on the object
In the case of the Sphere shape, the object will appears unchanged but deselecting the edges and reselect all of them, we'll actually see the edges generated by the Bevel action. If we undo a couple of time, the object will eventually show the correct result.

This is reproducible also from the Bevel settings window, playing with very small value will produce the right effect but as soon as we pass a certain value where the edges will intersect each other, the error will occur.