fresh world crashes when flying around?

playing on an I7 and gtx1080 i was generating a new world and flying around and game started crashing and when opening the world again a few seconds of lagg and a crash afterwards (crash log is down below) another note loaded the world in other pre releases and had no issue with the same terrain and location

 crash report attached 

 crash-2018-07-13_22.57.28-client.txt