Just purchased - single player crash on startup; can't play 1.12.2

I just bought this game for my son.
He was very exited only to get sorely disappointed.
We tried creating a world for him in single player.
Program gets busy (generating terrain or something) and eventually pops a larger window (which I suppose it the actual game's window), then crashes.
I restarted the same, enabled logging - same thing.
Here is the log, 100% repeatable:
https://paste.ubuntu.com/p/Ck7QkT6z6Z/

So far, I ain't happy guys and neither is my kid.
Get cranking or I am getting a refund.

BTW, on the window with the 'CLOSE' button, clicking 'View crash report' does nothing.

Thanks!

PS.

Please search before creating a new issue!
Nope. I paid, you search and do whatever needs to be done to fix this bug.