Server crash (possibly due to Wurt?)

Me and a few other where playing on a pub (not an official one, but still) Me and another one where playing Wurt and it was summer. We where basing in the caves to escape the heat and for the food, because plants are dried up.

So basically what happened is that there where a worm wave incoming and all but me died. We all agreed on a rollback. 5 seconds in and the server did not rollback and we where all very confused. Around 10 seconds later and the server crashed with the note "the server is unavalible", or something like that. (I do not have a screen of it, sorry)

Upon getting back to the server list to possibly rejoin, I got this:

It kept doing this for about a minute untill the server vanished. Here's a few things to hopefully note:

It was summer

There where 2 Wurts on the server (me and another) but there where around 6 or so people overall (4 non-Wurts. 2 of them where in the caves with us)

We had a Merm King, parked aboveground (mentioning this because he seems buggy) I also had a merm guard precrafted.

NO mods.