How it happened:
I was in Hamlet as Wheeler, I reconstructed the Stone Thing with all the 4 Things and used it to start World 2
What I was carrying was: 10-12 bundled wraps, a pith hat, a backpack, a Mant Mask, and her Pew-matic, with 10-20 stale seeds stored inside it.
I selected Wheeler for my second world, after the world stopped generating I saw wheeler and the Maxameleon for half a second and then the crash appeared (as shown above).
I am assuming the seeds stored inside the Pew-matic were the reason behind this crash?
I hope you can fix this problem soon, as of now I am unable to play on my world.
Here is a screenshot of the crash with no mods enabled:
Steps: A) As Wheeler I used The Fully Constructed Stone Thing with: 10-12 Bundled Wraps, Pith Hat, Backpack, Mant Mask, and the Pew-matic Horn with 10-20 stale seeds inside it. B) New selected character for World 2 was Wheeler, once the world finished generating the game crashed.