[MC-187500] Nether not accessible

When entering nether portal, player gets kicked from server displaying internal server error

log shows this prior to entering nether portal:

[02:16:01] [Server thread/WARN]: Failed to handle packet for /192.168.1.159:52534

s: Ticking player

at ze.w_(SourceFile:482) ~inecraft_server.1.16-pre1.jar:?]

at zv.b(SourceFile:206) ~inecraft_server.1.16-pre1.jar:?]

at me.a(SourceFile:234) ~inecraft_server.1.16-pre1.jar:?]

at zu.c(SourceFile:171) ~inecraft_server.1.16-pre1.jar:?]

at net.minecraft.server.MinecraftServer.b(SourceFile:885) ~inecraft_server.1.16-pre1.jar:?]

at yd.b(SourceFile:306) ~inecraft_server.1.16-pre1.jar:?]

at net.minecraft.server.MinecraftServer.a(SourceFile:812) ~inecraft_server.1.16-pre1.jar:?]

at net.minecraft.server.MinecraftServer.v(SourceFile:671) ~inecraft_server.1.16-pre1.jar:?]

at net.minecraft.server.MinecraftServer.a(SourceFile:256) ~inecraft_server.1.16-pre1.jar:?]

at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]

Caused by: java.lang.NullPointerException

at ze.a(SourceFile:651) ~inecraft_server.1.16-pre1.jar:?]

at aoj.bg(SourceFile:1900) ~inecraft_server.1.16-pre1.jar:?]

at aoj.ad(SourceFile:437) ~inecraft_server.1.16-pre1.jar:?]

at aov.ad(SourceFile:320) ~inecraft_server.1.16-pre1.jar:?]

at aoj.j(SourceFile:419) ~inecraft_server.1.16-pre1.jar:?]

at aov.j(SourceFile:2181) ~inecraft_server.1.16-pre1.jar:?]

at bdy.j(SourceFile:275) ~inecraft_server.1.16-pre1.jar:?]

at ze.w_(SourceFile:418) ~inecraft_server.1.16-pre1.jar:?]

... 9 more

[02:16:01] [Server thread/INFO]: M1K3YP00H lost connection: Internal server error

[02:16:01] [Server thread/INFO]: M1K3YP00H left the game

need anything else let me know