It's not a server crash

[Server thread/ERROR] [net.minecraft.world.level.chunk.storage.EntityStorage/]: An Entity type entity.rats.purifying_liquid has thrown an exception trying to write state. It will not persist. Report this to the mod author
net.minecraft.ReportedException: Saving entity NBT
at net.minecraft.world.entity.Entity.m_20240_(Entity.java:1679) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.Entity.m_20086_(Entity.java:1584) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.Entity.m_20223_(Entity.java:1591) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.chunk.storage.EntityStorage.m_156565_(EntityStorage.java:93) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[?:?]
at net.minecraft.world.level.chunk.storage.EntityStorage.m_141971_(EntityStorage.java:90) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157512_(PersistentEntitySectionManager.java:217) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157568_(PersistentEntitySectionManager.java:234) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157583_(PersistentEntitySectionManager.java:252) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:274) ~[fastutil-8.5.9.jar%2390!/:?]
at it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:306) ~[fastutil-8.5.9.jar%2390!/:?]
at it.unimi.dsi.fastutil.longs.AbstractLongCollection.removeIf(AbstractLongCollection.java:159) ~[fastutil-8.5.9.jar%2390!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157577_(PersistentEntitySectionManager.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157506_(PersistentEntitySectionManager.java:270) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:355) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:893) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:273) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at java.lang.Thread.run(Thread.java:842) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.network.syncher.SynchedEntityData$DataItem.m_135403_()" because the return value of "net.minecraft.network.syncher.SynchedEntityData.m_135379_(net.minecraft.network.syncher.EntityDataAccessor)" is null
at net.minecraft.network.syncher.SynchedEntityData.m_135370_(SynchedEntityData.java:120) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.projectile.ThrowableItemProjectile.m_37454_(ThrowableItemProjectile.java:37) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.projectile.ThrowableItemProjectile.m_7380_(ThrowableItemProjectile.java:54) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.Entity.m_20240_(Entity.java:1658) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
... 21 more
[2610월2023 23:28:05.102] [Server thread/ERROR] [net.minecraft.world.level.chunk.storage.EntityStorage/]: An Entity type entity.rats.purifying_liquid has thrown an exception trying to write state. It will not persist. Report this to the mod author
net.minecraft.ReportedException: Saving entity NBT
at net.minecraft.world.entity.Entity.m_20240_(Entity.java:1679) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.Entity.m_20086_(Entity.java:1584) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.Entity.m_20223_(Entity.java:1591) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.chunk.storage.EntityStorage.m_156565_(EntityStorage.java:93) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[?:?]
at net.minecraft.world.level.chunk.storage.EntityStorage.m_141971_(EntityStorage.java:90) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157512_(PersistentEntitySectionManager.java:217) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157568_(PersistentEntitySectionManager.java:234) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157583_(PersistentEntitySectionManager.java:252) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:274) ~[fastutil-8.5.9.jar%2390!/:?]
at it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:306) ~[fastutil-8.5.9.jar%2390!/:?]
at it.unimi.dsi.fastutil.longs.AbstractLongCollection.removeIf(AbstractLongCollection.java:159) ~[fastutil-8.5.9.jar%2390!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157577_(PersistentEntitySectionManager.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157506_(PersistentEntitySectionManager.java:270) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:355) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:893) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:273) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at java.lang.Thread.run(Thread.java:842) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.network.syncher.SynchedEntityData$DataItem.m_135403_()" because the return value of "net.minecraft.network.syncher.SynchedEntityData.m_135379_(net.minecraft.network.syncher.EntityDataAccessor)" is null
at net.minecraft.network.syncher.SynchedEntityData.m_135370_(SynchedEntityData.java:120) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.projectile.ThrowableItemProjectile.m_37454_(ThrowableItemProjectile.java:37) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.projectile.ThrowableItemProjectile.m_7380_(ThrowableItemProjectile.java:54) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
at net.minecraft.world.entity.Entity.m_20240_(Entity.java:1658) ~[server-1.20.1-20230612.114412-srg.jar%23169!/:?]
... 21 more