Snapshot 18w50a constantly crashing

Understandably, it is a snapshot so there will be some mishaps. But only recently (a month and 1/2 I think, somewhere near there) and it started crashing constantly. I mean I will play for about three minutes, and it stops. The error message says "exception generating new chunk"

FYI: these reports are from the same day, just minutes away from each other, so I don't know if anything is different.