Crash if you enter a Lan World

When I enter a LAN World, my game closes, and when my brother enters on my LAN World her game closes, in the snapshot 18w07c

LOG:

[15:41:21] [Client thread/INFO]: Setting user: 4KNMEMBERMODEHZ
[15:41:24] [Client thread/WARN]: Skipping bad option: lastServer:
[15:41:24] [Client thread/INFO]: LWJGL Version: 3.1.2 build 29
[15:41:25] [Client thread/INFO]: Reloading ResourceManager: Default
[15:41:26] [Client thread/WARN]: Missing sound for event: minecraft:block.pumpkin.carve
[15:41:26] [Sound Library Loader/INFO]: Starting up SoundSystem...
[15:41:27] [Thread-1/INFO]: Initializing No Sound
[15:41:27] [Thread-1/INFO]: (Silent Mode)
[15:41:27] [Thread-1/INFO]: OpenAL initialized.
[15:41:27] [Sound Library Loader/INFO]: Sound engine started
[15:41:36] [Client thread/INFO]: Created: 1024x512 textures-atlas
[15:41:39] [Client thread/INFO]: Narrator library for x64 successfully loaded
[15:41:39] [Client thread/ERROR]: Realms module missing
[15:41:51] [Client thread/INFO]: Connecting to 192.168.10.22, 58976
[15:42:03] [Client thread/FATAL]: Unreported exception thrown!
java.lang.NullPointerException: null
at vn$a.a(SourceFile:77) ~[18w07c.jar:?]
at vn$a.a(SourceFile:63) ~[18w07c.jar:?]
at axq.a(SourceFile:210) ~[18w07c.jar:?]
at bfs.a(SourceFile:263) ~[18w07c.jar:?]
at abd.a(SourceFile:1105) ~[18w07c.jar:?]
at ckd.b(SourceFile:1183) ~[18w07c.jar:?]
at ckd.a(SourceFile:1083) ~[18w07c.jar:?]
at ckd.a(SourceFile:944) ~[18w07c.jar:?]
at bxe.b(SourceFile:820) ~[18w07c.jar:?]
at bxe.a(SourceFile:381) [18w07c.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:141) [18w07c.jar:?]