When a javelin is placed in the enchantment table, no enchantments for it is generated and while it only gives an error in singleplayer in the logs, on the server, it caused the server to crash. This is with any of the javelin including those from better end.
Here is the specific error:
Failed to handle packet net.minecraft.class_2813@489c4d95, suppressing error
net.minecraft.class_148: Container click
at net.minecraft.class_1703.method_7593(class_1703.java:303)
at net.minecraft.class_3244.method_12076(class_3244.java:1770)
at net.minecraft.class_2813.method_12191(class_2813.java:58)
at net.minecraft.class_2813.method_11054(class_2813.java:13)
at net.minecraft.class_2600.method_11072(class_2600.java:22)
at net.minecraft.class_3738.run(class_3738.java:18)
at net.minecraft.class_1255.method_18859(class_1255.java:157)
at net.minecraft.class_4093.method_18859(class_4093.java:23)
at net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:776)
at net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:159)
at net.minecraft.class_1255.method_16075(class_1255.java:131)
at net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:758)
at net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:752)
at net.minecraft.class_1255.method_18857(class_1255.java:140)
at net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:737)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:669)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.NullPointerException: Cannot invoke "java.util.List.forEach(java.util.function.Consumer)" because "currentEnchantments" is null
at net.minecraft.class_1890.handler$ccc000$getPossibleEntriesMixin(class_1890.java:1047)
at net.minecraft.class_1890.method_8229(class_1890.java)
at net.minecraft.class_1890.method_8230(class_1890.java:365)
at net.minecraft.class_1718.method_7637(class_1718.java:212)
at net.minecraft.class_1718.method_17411(class_1718.java:127)
at net.minecraft.class_3914.method_17394(class_3914.java:35)
at net.minecraft.class_3914$2.method_17395(class_3914.java:22)
at net.minecraft.class_3914.method_17393(class_3914.java:34)
at net.minecraft.class_1718.method_7609(class_1718.java:106)
at net.minecraft.class_1718$1.method_5431(class_1718.java:32)
at net.minecraft.class_1277.redirect$bnm000$fabric_redirectMarkDirty(class_1277.java:543)
at net.minecraft.class_1277.method_5447(class_1277.java:140)
at net.minecraft.class_1735.method_7673(class_1735.java:61)
at net.minecraft.class_1735.method_32755(class_1735.java:151)
at net.minecraft.class_1703.method_30010(class_1703.java:414)
at net.minecraft.class_1703.method_7593(class_1703.java:293)
... 17 more

And the server crash log:
[crash-2022-10-23_16.50.02-server.txt](https://github.com/Globox1997/MedievalWeapons/files/9847107/crash-2022-10-23_16.50.02-server.txt)

Might be fixed with 1c9f489

Reopen if still persistent.