Reproduction steps:
1. Create the new project;
2. Create an empty gameobject;
3. Add RigidBody 2D and Circle Collider 2D components to created gameobject;
4. Drag the gameobject into Project window (make a prefab);

Actual result: Unity crashes in <b2Body::SetActive>.
Expected result: Unity should not crash and a prefab should be created.

Reproduced with: 5.5.1p2, 5.5.1p3
Not reproducible with: 5.4.5p1, 5.5.0f1, 5.5.1p1
Regression introduced in 5.5.1p2

Fixed in 5.5.2f1