huge error log

An Unhandled Error Happened - The game has run into an unhandled error. It may be possible to continue, but the errors may get worse. The safest option is to fully restart the game and load the latest save. It may be possible to make a save now.
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Number of species in this patch = 2
Particles are already correct, no need to recreate
Starting preload of 76 stage resources
Reused 76 already loaded resources
Stage load finished, will enter properly now
Jukebox: starting track: res://assets/sounds/microbe-theme-6.ogg position: 192.84462
Jukebox: starting track: res://assets/sounds/soundeffects/microbe-ambience-3.ogg position: 288.29895
Simulation system failure (threaded run for main thread): System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
   at Systems.MicrobeVisualsSystem.GetMulticellularMembraneDataIfReadyOrStartGenerating(CellTemplate cellProperties, OrganelleLayout`1 organelleContainer, Int64 leaderCellId, Int64 cellId, MulticellularSpeciesMember& multicellular, MulticellularGrowth& growthOrder, Int32 currentCellIndex, Int32 nextBodyPlanCellToGrowIndex) in /home/hhyyrylainen/Projects/Thrive/src/microbe_stage/systems/MicrobeVisualsSystem.cs:line 394
   at MicrobeWorldSimulation.OnProcessFixedWithThreads(Single delta) in /home/hhyyrylainen/Projects/Thrive/src/microbe_stage/MicrobeWorldSimulation.generated.cs:line 217
Simulation system failure (threaded run for main thread): System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
   at Systems.MicrobeVisualsSystem.GetMulticellularMembraneDataIfReadyOrStartGenerating(CellTemplate cellProperties, OrganelleLayout`1 organelleContainer, Int64 leaderCellId, Int64 cellId, MulticellularSpeciesMember& multicellular, MulticellularGrowth& growthOrder, Int32 currentCellIndex, Int32 nextBodyPlanCellToGrowIndex) in /home/hhyyrylainen/Projects/Thrive/src/microbe_stage/systems/MicrobeVisualsSystem.cs:line 394
   at MicrobeWorldSimulation.OnProcessFixedWithThreads(Single delta) in /home/hhyyrylainen/Projects/Thrive/src/microbe_stage/MicrobeWorldSimulation.generated.cs:line 217
Simulation system failure (threaded run for thread 2): System.NullReferenceException: Object reference not set to an instance of an object.
   at Arch.Core.QueryArchetypeEnumerator.MoveNext() in /home/hhyyrylainen/Projects/Thrive/third_party/Arch/src/Arch/Core/Enumerators.cs:line 112
   at Arch.Core.QueryChunkEnumerator.MoveNext() in /home/hhyyrylainen/Projects/Thrive/third_party/Arch/src/Arch/Core/Enumerators.cs:line 211
   at MicrobeWorldSimulation.<>c__DisplayClass126_0.<OnProcessFixedWithThreads>b__0() in /home/hhyyrylainen/Projects/Thrive/src/microbe_stage/MicrobeWorldSimulation.generated.cs:line 41

exception: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Arch.Core.QueryArchetypeEnumerator.MoveNext() in /home/hhyyrylainen/Projects/Thrive/third_party/Arch/src/Arch/Core/Enumerators.cs:line 112
   at Arch.Core.QueryChunkEnumerator.MoveNext() in /home/hhyyrylainen/Projects/Thrive/third_party/Arch/src/Arch/Core/Enumerators.cs:line 211
   at MicrobeWorldSimulation.<>c__DisplayClass126_0.<OnProcessFixedWithThreads>b__0() in /home/hhyyrylainen/Projects/Thrive/src/microbe_stage/MicrobeWorldSimulation.generated.cs:line 41
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   --- End of inner exception stack trace ---