Server occasionally crashes. Here is the log.

[01:11:36] [Server thread/ERROR]: Exception stopping the server
net.minecraft.class_148: Saving entity NBT
at net.minecraft.class_1297.method_5647(class_1297.java:1724) ~[server-intermediary.jar:?]
at net.minecraft.class_1297.method_5786(class_1297.java:1642) ~[server-intermediary.jar:?]
at net.minecraft.class_1297.method_5662(class_1297.java:1650) ~[server-intermediary.jar:?]
at net.minecraft.class_5565.method_31734(class_5565.java:109) ~[server-intermediary.jar:?]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762) ~[?:?]
at net.minecraft.class_5565.method_31760(class_5565.java:107) ~[server-intermediary.jar:?]
at net.minecraft.class_5579.method_31812(class_5579.java:300) ~[server-intermediary.jar:?]
at net.minecraft.class_5579.method_31837(class_5579.java:317) ~[server-intermediary.jar:?]
at net.minecraft.class_5579.method_31842(class_5579.java:395) ~[server-intermediary.jar:?]
at it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:285) ~[fastutil-8.5.6.jar:?]
at net.minecraft.class_5579.method_31836(class_5579.java:393) ~[server-intermediary.jar:?]
at net.minecraft.class_3218.method_14176(class_3218.java:764) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_3723(MinecraftServer.java:527) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_3782(MinecraftServer.java:593) ~[server-intermediary.jar:?]
at net.minecraft.class_3176.method_3782(class_3176.java:547) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:697) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:258) ~[server-intermediary.jar:?]
at java.lang.Thread.run(Thread.java:833) [?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "java.util.UUID.getMostSignificantBits()" because "$$0" is null
at net.minecraft.class_4844.method_26275(class_4844.java:33) ~[server-intermediary.jar:?]
at net.minecraft.class_2512.method_25929(class_2512.java:185) ~[server-intermediary.jar:?]
at net.minecraft.class_2487.method_25927(class_2487.java:210) ~[server-intermediary.jar:?]
at io.github.llamarama.team.common.entity.caravantrader.CaravanTraderEntity.method_5652(CaravanTraderEntity.java:117) ~[Llamarama-1.8.1.jar:?]
at net.minecraft.class_1297.method_5647(class_1297.java:1706) ~[server-intermediary.jar:?]
... 18 more

When you say 1.19 you mean 1.19 exact or 1.19.x?

1.19 exact.

1.19 Fabric, and the version I am using is 1.8.1.

It seems to me the server crashes whenever a caravan trader wants to spawn.

When you say 1.19 you mean 1.19 exact or 1.19.x?

Your bug report needs more information. In the future please use the bug report template that we provide.

Anyways, for now please tell me the llamarama version you are using and the minecraft version you are in.