Server Crash / logs tell nothing

Hello, i have a lot of crash in my server without crash-logs, and in logs i can’t find any info about that. Someone told me to remove my world beacause its from older version of MC., is there any tool that can check my world? or do you have any ideas how to fix this crashes?

Log with crash:
Log after crash:

Minecraft: 1.12.2
SpongeAPI: 7.1.0-5ef8b0e3
Sponge: 1.12.2-7.1.10-SNAPSHOT
SpongeForge: 1.12.2-2838-7.1.10-RC4000
Minecraft Forge:
JVM: 1.8.0_241/64-bit (Oracle Corporation)

your spongeforge is forge 2838 while you are running minecraft forge 2821
not sure if this is the problem

Nothing change :confused:

Can’t keep up! Did the system time change, or is the server overloaded? Running 27215ms behind, skipping 544 tick(s)

That sounds like one very overloaded server… Running 27 seconds behind is pretty big.

Can you generate a timings report and share it?

And a new one, right after restart:

Sometimes i have memory leak:

Timings with new version 7.2 :