NRE when accessing new inventory system

[Former user]

The following error occurs when accessing the 1.11 inventory system in the editorscene:

[EXC 11:03:40.524] NullReferenceException: Object reference not set to an instance of an object
    SystemHeat.UI.SystemHeatOverlay.LateUpdate () (at <62910c6ed259449c96be144028a18339>:0)
    UnityEngine.DebugLogHandler:LogException(Exception, Object)
    ModuleManager.UnityLogHandle.InterceptLogHandler:LogException(Exception, Object)
    UnityEngine.Debug:CallOverridenDebugHandler(Exception, Object)