help error

[12:24:20] [Server thread/ERROR] [Sponge]: Error occurred while executing command 'help' for source EntityPlayerMP['Prolix'/513, l='world2', x=-7842.13, y=100.64, z=712.59]: id
java.lang.NullPointerException: id
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229) ~[minecraft_server.1.8.9.jar:?]
        at org.spongepowered.common.text.translation.SpongeTranslation.<init>(SpongeTranslation.java:42) ~[SpongeTranslation.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.common.registry.SpongeGameRegistry.getTranslationById(SpongeGameRegistry.java:337) ~[SpongeGameRegistry.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.common.command.MinecraftCommandWrapper.getUsage(MinecraftCommandWrapper.java:194) ~[MinecraftCommandWrapper.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.common.command.SpongeHelpCommand.getDescription(SpongeHelpCommand.java:102) ~[SpongeHelpCommand.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.common.command.SpongeHelpCommand.lambda$null$111(SpongeHelpCommand.java:85) ~[SpongeHelpCommand.class:1.8.9-1763-4.1.0-BETA-1219]
        at com.google.common.collect.Iterators$8.transform(Iterators.java:794) ~[minecraft_server.1.8.9.jar:?]
        at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48) ~[minecraft_server.1.8.9.jar:?]
        at java.util.AbstractCollection.toArray(AbstractCollection.java:141) ~[?:1.8.0_74]
        at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:258) ~[minecraft_server.1.8.9.jar:?]
        at org.spongepowered.common.command.SpongeHelpCommand.lambda$create$112(SpongeHelpCommand.java:85) ~[SpongeHelpCommand.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.api.command.spec.CommandSpec.process(CommandSpec.java:331) ~[CommandSpec.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.api.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:331) ~[SimpleDispatcher.class:1.8.9-1763-4.1.0-BETA-1219]
        at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:268) [SpongeCommandManager.class:1.8.9-1763-4.1.0-BETA-1219]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:80) [bd.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:815) [lm.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:794) [lm.class:?]
        at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:37) [ie.class:?]
        at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:9) [ie.class:?]
        at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:106) [PacketUtil.class:1.8.9-1763-4.1.0-BETA-1219]
        at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$0(SourceFile:51) [fh$1.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [fh$1.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_74]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_74]
        at net.minecraft.util.Util.func_181617_a(SourceFile:44) [g.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:660) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344) [ko.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]