NullReferenceException: Object reference not set to an instance of an object
  at LiquidContainer.GetLiquidItem () [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at LiquidContainer.HasLiquidItem () [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at LiquidContainer.GetLiquidCount () [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at LiquidContainer.GetCurrentEnergy () [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.GetPassthroughAmount (System.Int32 outputSlot) [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.TouchInternal () [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.TouchIOState () [0x00009] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.MarkDirty () [0x0000f] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.MarkDirtyForceUpdateOutputs () [0x00007] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.OnCircuitChanged (System.Boolean forceUpdate) [0x00003] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at LiquidContainer.OnCircuitChanged (System.Boolean forceUpdate) [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.SendChangedToRootRecursive (System.Boolean forceUpdate, System.Collections.Generic.List`1[IOEntity]& existing) [0x00087] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.SendChangedToRoot (System.Boolean forceUpdate) [0x00006] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.Shutdown () [0x00000] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at IOEntity.DoServerDestroy () [0x00008] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at BaseNetworkable.DoEntityDestroy () [0x00026] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at BaseNetworkable.Kill (BaseNetworkable+DestroyMode mode) [0x00033] in <580b7002ce1d4e9abc37221990d28cb9>:0 
  at Oxide.Plugins.CapacityController+<GetContainerItems>c__Iterator0.MoveNext () [0x0018c] in <601e4be14ef34a7cbfd683ad03b18959>:0 
  at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00026] in <0618f269b594493b97c56ba78f03373a>:0 

getting this only when i load your plugin