The cave server crash when my friends and I led the Fishman army to massacre all directions

My friends and I are playing games on the server, and the characters we have chosen are all fish people.
When we led the Fishman army to hunt down monsters such as monkeys, spiders, and turtles, the server always suddenly shut down. I found the error log of the cave server crash and uploaded it to the attachment.
We have not enabled any server mods, so we speculate that there may be a problem with the source code. We hope that developers can help us. My friends and I attach great importance to game saves. Thank you very much!
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