Cities: Skylines

Cities: Skylines

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Error: HashSet have been modified while it was iterated over
I keep getting this error in game about HashSet have been modified while it was iterated over. This section of my output log repeats several times. Anyone know what this is?


(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

256,304ms | Simulation error: HashSet have been modified while it was iterated over
at System.Collections.Generic.HashSet`1+Enumerator[System.UInt16].CheckState () [0x00000] in <filename unknown>:0
at System.Collections.Generic.HashSet`1+Enumerator[System.UInt16].MoveNext () [0x00000] in <filename unknown>:0
at BuildingManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at BuildingManager.ISimulationManager.SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
at SimulationManager.SimulationStep () [0x00000] in <filename unknown>:0
at SimulationManager.SimulationThread () [0x00000] in <filename unknown>:0 [Core]