java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached

Summary

It is unclear when the error is caused, but as I understood it only when the player logged on to the server

Steps to reproduce

It started to appear at a random moment.

Current behavior

The error appears at a random moment and spams from 2-3 messages to 200...

Intended correct behavior

There should be no such mistakes

Server log file

1. Server Log
2. Player Join Error Start

Proposed fixes