Unity crashes when you try to access 'tooltip' property of SerializedProperty instance.

In attached project open TestScene scene and press Play. You'll get your crash.
This scene has empty object with attached script that tries to access tooltip property of SerializedProperty.
Looks like this.

void Start ()
{
SerializedObject serializedObject = new SerializedObject (ScriptableObject.CreateInstance<ScriptableObject>());
SerializedProperty iterator = serializedObject.GetIterator();

Debug.Log(iterator.tooltip);
}

On Debug it crashes.
Same result caт be received during debugging:
1. Set brreakpoint on Debug line (13)
2. Attach MD to Unity Editor
3. Press Play
4. In MD try to investigate properties of iterator variable.
Unity will crash.