My computer crashed during the wildling battle ; my honest mistake was to quick-save while in Castle Black after talking to Jon, and not having another save close enough. Now my savegame is stuck on Wildling Invasion part 6.

I tried to edit my save file through the editor but resetting the quest to Wildling Invasion part 1 breaks it. I am trying to find the variable that MnB can't process, probably a trigger or the state of an event, but I am not having any luck. Does anyone have an idea of what I could be missing please?