Server stopping for no reason

So my server in which I play with 2 of my friends keep crashing after an hour or so after starting up, when booting immediately again after crashing the server just start closing shortly after opening up, making us having to wait for a whole day for it to work for an hour again. After doing some research I can't seem to find a solution, the server have PaperMC and have no other plugin or mod nor anything that could cause significant lag in the server, please help.
Log: https://mclo.gs/BD7eMci
Server ip: TheFifthSMP.aternos.me