Upon loading or unloading a beacon and it's effects, it will throw an error to the console:

[09:33:16] [Server thread/ERROR]: Failed to load data for block entity Beacon
java.lang.NullPointerException
at apr.F(SourceFile:135) ~[minecraft_server.16w02a.jar:?]
at apr.m(SourceFile:88) ~[minecraft_server.16w02a.jar:?]
at apr.a(SourceFile:308) ~[minecraft_server.16w02a.jar:?]
at aps.b(SourceFile:108) [minecraft_server.16w02a.jar:?]
at asp.a(SourceFile:306) [minecraft_server.16w02a.jar:?]
at asp.a(SourceFile:83) [minecraft_server.16w02a.jar:?]
at asp.a(SourceFile:70) [minecraft_server.16w02a.jar:?]
at lo.f(SourceFile:124) [minecraft_server.16w02a.jar:?]
at lo.c(SourceFile:76) [minecraft_server.16w02a.jar:?]
at lo.d(SourceFile:91) [minecraft_server.16w02a.jar:?]
at ahp.a(SourceFile:297) [minecraft_server.16w02a.jar:?]
at ahp.f(SourceFile:293) [minecraft_server.16w02a.jar:?]
at ahp.o(SourceFile:674) [minecraft_server.16w02a.jar:?]
at apu.b(SourceFile:237) [minecraft_server.16w02a.jar:?]
at apu.a(SourceFile:219) [minecraft_server.16w02a.jar:?]
at apu.m(SourceFile:212) [minecraft_server.16w02a.jar:?]
at apu.c(SourceFile:244) [minecraft_server.16w02a.jar:?]
at ahp.k(SourceFile:1422) [minecraft_server.16w02a.jar:?]
at lp.k(SourceFile:552) [minecraft_server.16w02a.jar:?]
at net.minecraft.server.MinecraftServer.D(SourceFile:624) [minecraft_server.16w02a.jar:?]
at la.D(SourceFile:339) [minecraft_server.16w02a.jar:?]
at net.minecraft.server.MinecraftServer.C(SourceFile:552) [minecraft_server.16w02a.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:456) [minecraft_server.16w02a.jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]

The full log is attached