NullReferenceException at DoorManipulator.IOInput

[Slav]

When players press button at either launch site or airfield they get disconnected and this appears (other monuments are broken too such as water treatment):

https://i.imgur.com/DsjFPZS.png

When the button is pressed this comes up in console:

NullReferenceException: Object reference not set to an instance of an object

at DoorManipulator.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x0003c] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x00032] in <6eb90eff27a14f75a3dde064677999bf>:0 

at ORSwitch.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x00076] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x00032] in <6eb90eff27a14f75a3dde064677999bf>:0 

at CardReader.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x0001d] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x00032] in <6eb90eff27a14f75a3dde064677999bf>:0 

at ItemBasedFlowRestrictor.IOInput (IOEntity from, IOEntity+IOType inputType, System.Single inputAmount, System.Int32 slot) [0x00053] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.Solve () [0x00039] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.MarkDirty () [0x00011] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.MarkDirtyUpwards () [0x00032] in <6eb90eff27a14f75a3dde064677999bf>:0 

at IOEntity.MarkDirty () [0x00000] in <6eb90eff27a14f75a3dde064677999bf>:0 

at PressButton.Press (BaseEntity+RPCMessage msg) [0x0001c] in <6eb90eff27a14f75a3dde064677999bf>:0 

at PressButton.OnRpcMessage (BasePlayer player, System.UInt32 rpc, Network.Message msg) [0x000e5] in <6eb90eff27a14f75a3dde064677999bf>:0 

UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)

UnityEngine.DebugLogHandler:LogException(Exception, Object)

UnityEngine.Logger:LogException(Exception, Object)

UnityEngine.Debug:LogException(Exception)

PressButton:OnRpcMessage(BasePlayer, UInt32, Message)

BaseEntity:SV_RPCMessage(UInt32, Message)

ServerMgr:OnRPCMessage(Message)

ServerMgr:OnNetworkMessage(Message)

Facepunch.Network.Raknet.Server:ConnectedPacket(Connection)

Facepunch.Network.Raknet.Server:Cycle()

ServerMgr:Update()

(Filename: <6eb90eff27a14f75a3dde064677999bf> Line: 0)