Just like that when loading the world somewhere deep in the world, the game suddenly crashed and will just crash again when trying to enter the save file again.
crash-2017-07-20_23.00.33-client.txt
crash-2017-07-20_23.01.47-client.txt

Unfortunately, I can not pinpoint the cause of the crash without saving. I suppose that one of the trees was generated incorrectly and an infinite loop was formed. I'm not even surprised that it was just a tropical tree ))) It is one of the most difficult in generation.
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You can try to delete the folder with a misty world (DIM69), change the seed in the config file and go into the world again.

Alright, I'll try that if I ever encounter a crash again since I already deleted the world since it was just a test world. Thank you!