When i rightclick a cage with a dna sampler the game crashes with this error: https://pastebin.com/tq42CAaa

Also a similar error also occurs while hovering over the data sampler.

I hope I can fix it in next version. Can you tell me which entity did you hit with the DNA Sampler?

Ohh, totaly forgot. I fisrt tried with a stoneling from quark. And then with a normal minecraft zombie. Game crashed in both instances.

That's strange. Was it possible to sample the stoneling? Did you add your own json file? When I try to reproduce the bug, when I hit the stoneling it says "Cannot sample this type of entity". I hope it will be fixed in next version.

yes i made my own json. This one:
stoneling.txt