I believe the plugin is "VirtualSpawner" as it uses a data base and it adde a "null" cluster or something which is what it says in a plugin called spark

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The server has stopped responding! This is (probably) not a Spigot bug.
If you see a plugin in the Server thread dump below, then please report it to that author
Especially if it looks like HTTP or MySQL operations are occurring
If you see a world save or edit, then it means you did far more than your server can handle at once
If this is the case, consider increasing timeout-time in spigot.yml but note that this will replace the crash with LARGE lag spikes
If you are unsure or still think this is a Spigot bug, please report to https://www.spigotmc.org/
Be sure to include ALL relevant console errors and Minecraft crash reports
Spigot version: 3741-Spigot-d1bd3bd-ccbc6ab (MC: 1.19.4)
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Server thread dump (Look for plugins here before reporting to Spigot!):
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Current Thread: Server thread
PID: 24 | Suspended: false | Native: false | State: WAITING
Stack:
[email protected]/jdk.internal.misc.Unsafe.park(Native Method)
[email protected]/java.util.concurrent.locks.LockSupport.park(LockSupport.java:211)
[email protected]/java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1864)
[email protected]/java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3463)
[email protected]/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3434)
[email protected]/java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1898)
[email protected]/java.util.concurrent.CompletableFuture.join(CompletableFuture.java:2117)
net.minecraft.world.level.chunk.storage.IChunkLoader.o(IChunkLoader.java:171)
net.minecraft.server.level.PlayerChunkMap.a(PlayerChunkMap.java:513)
net.minecraft.server.level.ChunkProviderServer.a(ChunkProviderServer.java:347)
net.minecraft.server.level.WorldServer.a(WorldServer.java:908)
net.minecraft.server.MinecraftServer.a(MinecraftServer.java:796)
net.minecraft.server.MinecraftServer.t(MinecraftServer.java:911)
net.minecraft.server.dedicated.DedicatedServer.t(DedicatedServer.java:686)
net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1050)
net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304)
net.minecraft.server.MinecraftServer$$Lambda$4450/0x000000080188da80.run(Unknown Source)
[email protected]/java.lang.Thread.run(Thread.java:833)
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Entire Thread Dump:

06:19:59

[email protected]/java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:401)
[email protected]/java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:903)
[email protected]/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1061)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1122)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[email protected]/java.lang.Thread.run(Thread.java:833)
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Current Thread: Attach Listener
PID: 1774 | Suspended: false | Native: false | State: RUNNABLE
Stack:
------------------------------
Current Thread: IO-Worker-62
PID: 5010 | Suspended: false | Native: false | State: RUNNABLE
Thread is waiting on monitor(s):
Locked on:net.minecraft.world.level.chunk.storage.RegionFile.a(RegionFile.java:328)
Stack:
[email protected]/sun.nio.ch.FileDispatcherImpl.pwrite0(Native Method)
[email protected]/sun.nio.ch.FileDispatcherImpl.pwrite(FileDispatcherImpl.java:68)
[email protected]/sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:130)
[email protected]/sun.nio.ch.IOUtil.write(IOUtil.java:97)
[email protected]/sun.nio.ch.IOUtil.write(IOUtil.java:67)
[email protected]/sun.nio.ch.FileChannelImpl.writeInternal(FileChannelImpl.java:878)
[email protected]/sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:864)
net.minecraft.world.level.chunk.storage.RegionFile.a(RegionFile.java:328)
net.minecraft.world.level.chunk.storage.RegionFile$ChunkBuffer.close(RegionFile.java:439)
[email protected]/java.util.zip.DeflaterOutputStream.close(DeflaterOutputStream.java:249)
[email protected]/java.io.FilterOutputStream.close(FilterOutputStream.java:188)
[email protected]/java.io.FilterOutputStream.close(FilterOutputStream.java:188)
net.minecraft.world.level.chunk.storage.RegionFileCache.a(RegionFileCache.java:155)
net.minecraft.world.level.chunk.storage.IOWorker.a(SourceFile:260)
net.minecraft.world.level.chunk.storage.IOWorker.a(SourceFile:250)
net.minecraft.world.level.chunk.storage.IOWorker$$Lambda$7783/0x000000080251ae70.run(Unknown Source)
net.minecraft.util.thread.PairedQueue$b.run(SourceFile:60)
net.minecraft.util.thread.ThreadedMailbox.h(SourceFile:91)
net.minecraft.util.thread.ThreadedMailbox.a(SourceFile:146)
net.minecraft.util.thread.ThreadedMailbox.run(SourceFile:102)
[email protected]/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[email protected]/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[email protected]/java.lang.Thread.run(Thread.java:833)
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