That is very weird. The crash occured when VST Live tried to get a video frame, it would not do that unless locating (stop), or playing.
Before you went away, were there at least some seconds wher it was stopped and you would have noticed a crash? or did you stop and walk right away?
Just left my rehearsal room. The very maximum is hitting CTRL+S (save… by reflex…also if I hit ctrl-s, save proc takes long with my project, but can’t remember if I hit save)