Crashing when editing near sim edge

The client keeps crashing when I edit the terrain near the sim edge.

I am trying to smooth my land so it matches the adjacent land in the next sim.

I am using the latest viewer. (voice version, but voice is disabled)

Edit:
It seems to only happen when I use the "flatten tool", "Large" and flatten with the center in the next sim.

I was able to smooth out the land transition by using "Select" and flattening the land with Raise/lower to match the next sim and then selecting 4m over and use smooth.

I would submit a ticket and let them know about the problem your having..
Or check Jira and see if anyone else has been having the same problem..

Good Luck!
Jeza