[Error] m_PendingRadiositySystemHashes . empty()

In some cases I got the error m_PendingRadiositySystemHashes.empty() after cleaning the GI cache for some simply testing purposes with some cubes and the Enlighten loops at clustering 5/11.
Enough RAM and running Unity only.

Bug Report : 741868

Please file a bug report, this shouldn’t happen.

Reported also
m_SystemData.empty()
UnityEditor.HostView:OnGUI()

Bug Report: 741871

Reported also
m_SystemData.empty()
UnityEditor.GenericMenu:CatchMenu(Object, String[ ], Int32)

Bug Report: 741875