I haven't tracked this down thoroughly but:
Cannot destroy Component while GameObject is being activated or deactivated.
UnityEngine.Object😃estroyImmediate(Object)
Spine.Unity.BoundingBoxFollower:ClearColliders() (at Assets/Standard Assets/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs:172)
Spine.Unity.BoundingBoxFollower:Clear() (at Assets/Standard Assets/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs:89)
Spine.Unity.BoundingBoxFollower😮nDisable() (at Assets/Standard Assets/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs:83)