Array index is out of range. [System.IndexOutOfRangeException]

Details:
No details
System.IndexOutOfRangeException: Array index is out of range.
  at CitizenManager.GetGroupCitizenInfo (ColossalFramework.Math.Randomizer& r, Service service, Gender gender, SubCulture subCulture, AgePhase agePhase) [0x00000] in <filename unknown>:0
  at FireTruckAI.CreateFireman (UInt16 vehicleID, .Vehicle& data, AgePhase agePhase) [0x00000] in <filename unknown>:0
  at FireTruckAI.ArriveAtTarget (UInt16 vehicleID, .Vehicle& data) [0x00000] in <filename unknown>:0
  at FireTruckAI.ArriveAtDestination (UInt16 vehicleID, .Vehicle& vehicleData) [0x00000] in <filename unknown>:0
  at CSL_Traffic.CustomCarAI.SimulationStep (.CarAI carAI, UInt16 vehicleID, .Vehicle& vehicleData, .Frame& frameData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
  at CSL_Traffic.CustomFireTruckAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, .Frame& frameData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
  at VehicleAI.SimulationStep (UInt16 vehicleID, .Vehicle& vehicleData, UInt16 leaderID, .Vehicle& leaderData, Int32 lodPhysics) [0x00000] in <filename unknown>:0
  at CarAI.SimulationStep (UInt16 vehicleID, .Vehicle& data, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0
  at FireTruckAI.SimulationStep (UInt16 vehicleID, .Vehicle& data, Vector3 physicsLodRefPos) [0x00000] in <filename unknown>:0
  at VehicleManager.SimulationStepImpl (Int32 subStep) [0x00000] in <filename unknown>:0
  at SimulationManagerBase`2[Manager,Properties].SimulationStep (Int32 subStep) [0x00000] in <filename unknown>:0
  at VehicleManager.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