I experienced some server crashes recently with version 5.1.3 on Windows. At the moment the server is up and running, but can you take a look at the crash dump?
I suspected it has something to do with user support notifications, as we started using them the day before the crashed started.

I'm not so good at crash dump analysis but I tried it anyway. It look like the server crashes while NXSL tries to process an invalid timestamp?

I can confirm, this metric transform script crashes the server process:
time = DateTime(253402297200);
return time.format("%d.%m.%Y");

Great analysis, thank you!

Forwarded to developers.