null ref in ToolBase.OnEnable

[originalfoo]

- NullReferenceException: Object reference not set to an instance of an object
  at ToolBase.OnEnable () [0x00000] in <filename unknown>:0 
UnityEngine.GameObject:Internal_AddComponentWithType(Type)
UnityEngine.GameObject:AddComponent(Type)
UnityEngine.GameObject:AddComponent()
ColossalFramework.Singleton`1:get_instance()
ColossalFramework.Singleton`1:Ensure()
- QuayUpgradeTool.Loader:OnLevelLoaded(LoadMode)
-LoadingWrapper:DMD<DMD<OnLevelLoaded_Patch1>?786848512::OnLevelLoaded_Patch1>(LoadingWrapper, UpdateMode)
<LoadLevelComplete>c__Iterator9:MoveNext()
LoadingManager:Update()

[originalfoo]

decrufted_log.txt