Server closing on it's own with people inside?

Hello! This happened twice today. The server simply closes on it's own, even with users inside and not idle. It just randomly starts closing, nothing to point out in the console. It feels weird because I'm literally moving and breaking blocks when it starts closing. It does not seem to be a crash, just a simple closing.

Here are the logs if they matter: https://mclo.gs/UE1jBxr

Anyone know what might be provoking this? It would be rather annoying that the server shuts down while people are playing and then we have to wait half an hour to get past the queue (we hadn't have to wait that long, but could happen).

Thanks in advance!

Oh I just noticed that the server isn't actually closing, it's crashing. Since I went to the website and it'd say "stopping" I assumed the console was stopping too. Thanks for the help. Problem found then.