160421T213747.195 [ERROR] [ConfigNode.CleanupInput] Input is null
at System.Environment.get_StackTrace()
at ConfigNode.CleanupInput(System.String value)
at ConfigNode.AddValue(System.String name, System.String value)
at BaseFieldList.Save(.ConfigNode node)
at PartModule.Save(.ConfigNode node)
at ProtoPartModuleSnapshot..ctor(.PartModule module)
at ProtoPartSnapshot..ctor(.Part PartRef, .ProtoVessel protoVessel)
at KIS.KIS_Shared.PartSnapshot(.Part part)
at KIS.KIS_Item..ctor(.Part part, KIS.ModuleKISInventory inventory, Single quantity)
at KIS.ModuleKISInventory.AddItem(.Part part, Single qty, Int32 slot)
at KIS.ModuleKISInventory.GuiInventory(Int32 windowID)
at KIS.ModuleKISInventory.GuiMain(Int32 windowID)
at UnityEngine.GUILayout+LayoutedWindow.DoWindow(Int32 windowID)
at UnityEngine.GUI.CallWindowDelegate(UnityEngine.WindowFunction func, Int32 id, UnityEngine.GUISkin _skin, Int32 forceRect, Single width, Single height, UnityEngine.GUIStyle style)

It doesn't seem it affects anything.