Help ArgumentNullException: Value cannot be null.

[x1290148]

ArgumentNullException: Value cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) (at <ad04dee02e7e4a85a1299c7ee81c79f6>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) (at <ad04dee02e7e4a85a1299c7ee81c79f6>:0)
Obi.ObiMeshShapeTracker.UpdateMeshData () (at Assets/Obi/Scripts/Collisions/ColliderTrackers/Trackers3D/ObiMeshShapeTracker.cs:81)
Obi.ObiMeshShapeTracker..ctor (UnityEngine.MeshCollider collider) (at Assets/Obi/Scripts/Collisions/ColliderTrackers/Trackers3D/ObiMeshShapeTracker.cs:59)
Obi.ObiCollider.CreateTracker () (at Assets/Obi/Scripts/Collisions/ObiCollider.cs:75)
Obi.ObiColliderBase.AddCollider () (at Assets/Obi/Scripts/Collisions/ObiColliderBase.cs:133)
Obi.ObiCollider.Awake () (at Assets/Obi/Scripts/Collisions/ObiCollider.cs:112)
UnityEngine.GameObject:SetActive(Boolean)
<WaitFade>d__44:MoveNext() (at Assets/Scripts/BZManager.cs:385)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)
It happened while I was running the game. How do I fix this?