Deserialized BRL.map leads to segfaults

The "old"-function leads (sometimes) to a segfault within the For local handler:TRoomHandler = EachIn oldHandlers.Values()-loop.
The other function does not segfault.
    Function OLDonSaveGameLoad:int( triggerEvent:TEventBase )
        TLogger.Log("TRoomHandlerCollection", "Savegame loaded - reassigning handlers", LOG_DEBUG | LOG_SAVELOAD)
        local oldHandlers:TMap = GetInstance().handlers.Copy()
        'request each handler to re-assign (the new instance of the handler)
        'ATTENTION: this allows to handle this individually for each
        '           handler. The alternative (storing a "handle:string"-
        '           property in each handler) would lead to problems
        '           as soon as some offices have varying handlers
        '           or a handler wants to take care of multiply rooms 
        GetInstance().handlers.Clear()

        For local handler:TRoomHandler = EachIn oldHandlers.Values()
            if handler
                handler.RegisterHandler()
                print TTypeID.ForObject(handler).name() + " registered"
            endif
        Next
print "reregistered"

        'inform the (new) handlers
        For local handler:TRoomHandler = EachIn GetInstance().handlers.Values()
            handler.onSaveGameLoad( triggerEvent )
        Next
    End Function

    'called _after_ a game (and its data) got loaded
    Function onSaveGameLoad:int( triggerEvent:TEventBase )
        TLogger.Log("TRoomHandlerCollection", "Savegame loaded - reassigning handlers", LOG_DEBUG | LOG_SAVELOAD)
        local oldHandlers:TRoomHandler[]
        For local o:object = EachIn GetInstance().handlers.Values()
            if TRoomHandler(o) then oldHandlers :+ [TRoomHandler(o)]
        Next
        'request each handler to re-assign (the new instance of the handler)
        'ATTENTION: this allows to handle this individually for each
        '           handler. The alternative (storing a "handle:string"-
        '           property in each handler) would lead to problems
        '           as soon as some offices have varying handlers
        '           or a handler wants to take care of multiply rooms 
        GetInstance().handlers.Clear()

        For local handler:TRoomHandler = EachIn oldHandlers
            if handler
                'this modifies "GetInstance().handlers"
                handler.RegisterHandler()
                print TTypeID.ForObject(handler).name() + " registered"
            endif
        Next
print "reregistered"

        'inform the (new) handlers
        For local handler:TRoomHandler = EachIn GetInstance().handlers.Values()
            handler.onSaveGameLoad( triggerEvent )
        Next
    End Function
maxmods / brl.mod

Deserialized BRL.map leads to segfaults #3
