Null ref error

[Giantbean]

I updated a project to Unity 2021 and that had Obi update as well but I now have some errors I can't seem to track down. 

NullReferenceException: Object reference not set to an instance of an object

Obi.ObiCapsuleShapeTracker.UpdateIfNeeded () (at Assets/Obi/Scripts/Common/Collisions/ColliderTrackers/Trackers3D/ObiCapsuleShapeTracker.cs:27)

The null reference seems to be looking for a collider but I'm not sure where it's supposed to be?

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Full error:
NullReferenceException: Object reference not set to an instance of an object
Obi.ObiCapsuleShapeTracker.UpdateIfNeeded () (at Assets/Obi/Scripts/Common/Collisions/ColliderTrackers/Trackers3D/ObiCapsuleShapeTracker.cs:27)
Obi.ObiColliderBase.UpdateIfNeeded () (at Assets/Obi/Scripts/Common/Collisions/ObiColliderBase.cs:185)
Obi.ObiColliderWorld.UpdateColliders () (at Assets/Obi/Scripts/Common/Collisions/ObiColliderWorld.cs:361)
Obi.ObiUpdater.BeginStep (System.Single stepDeltaTime) (at Assets/Obi/Scripts/Common/Updaters/ObiUpdater.cs:54)
Obi.ObiFixedUpdater.FixedUpdate () (at Assets/Obi/Scripts/Common/Updaters/ObiFixedUpdater.cs:46)

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Trying to post an image of the inspector fails as it says the post is too long.