i figured out and wanna share, hope it helps to someone.
i had mercalli excellent stabilisation plugin crashing from time to time just after rendering without a reason. sometime it crashed sometime it didnt. of course there is always a reason to everything.
mercalli creates a temp track at the top of timeline during analysis.
there is a kind of mismatch when you have tracks group above the clip you need to analise. so the solution is to move the group down or the event or track on which it locates up just for the analysis time, so there are no groupped tracks above the event you want to stabilise.