Sometimes I can walk near the tree stone before crashing, but most of the time i crashed when walking up the stair| modwatch link: https://modwat.ch/u/HENREX2000 Edit: it seems that bijin aio's optimized mesh resources and legacy of the dragonborn's tools of kagrenec patch caused the problem Use the alternate version of Frea Iona and updating my LoTD patches solved the problem