Suddenly unplayable

ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

System.ThrowHelper.ThrowArgumentOutOfRangeException (System.ExceptionArgument argument, System.ExceptionResource resource) (at <695d1cc93cca45069c528c15c9fdd749>:0)
System.ThrowHelper.ThrowArgumentOutOfRangeException () (at <695d1cc93cca45069c528c15c9fdd749>:0)
Artable.OnCompleteWork (Worker worker) (at <6ab6b57553ed449280aa2485c86e9aab>:0)
Workable.CompleteWork (Worker worker) (at <6ab6b57553ed449280aa2485c86e9aab>:0)
Worker.CompleteWork () (at <6ab6b57553ed449280aa2485c86e9aab>:0)
Worker.Work (System.Single dt) (at <6ab6b57553ed449280aa2485c86e9aab>:0)
GameStateMachine`4+State+<>c__DisplayClass84_0[StateMachineType,StateMachineInstanceType,MasterType,DefType].<ToggleWork>b__1 (StateMachineInstanceType smi, System.Single dt) (at <6ab6b57553ed449280aa2485c86e9aab>:0)
BucketUpdater`1[DataType].Update (DataType data, System.Single dt) (at <1b5c2ff4f53d4a48b7159ed84d905978>:0)
UpdateBucketWithUpdater`1[DataType].Update (System.Single dt) (at <1b5c2ff4f53d4a48b7159ed84d905978>:0)
StateMachineUpdater+BucketGroup.AdvanceOneSubTick (System.Single dt) (at <1b5c2ff4f53d4a48b7159ed84d905978>:0)
StateMachineUpdater.AdvanceOneSimSubTick () (at <1b5c2ff4f53d4a48b7159ed84d905978>:0)
Game.SimEveryTick (System.Single dt) (at <6ab6b57553ed449280aa2485c86e9aab>:0)
Game.Update () (at <6ab6b57553ed449280aa2485c86e9aab>:0)

Build: U43-525812-V