Minecraft: 1.12.2
Forge: 14.23.2.2624
PlayerRevive: 1.2.11

If a Player die he get kicked from the Server with a "Internal server error" message. And they can't connect anymore. They have to restart Mincraft to connect again.

Here is my Serverlog.
Here is their Clientlog.

Can you try it without any other mods installed? My guess it's an incompatibility with another mod.

I will close this issue due to inactivity. Just reopen if the issue still persists.