[19:23:43] [Server thread/ERROR] [Sponge/]: Error occurred while executing command 'ubp' for source EntityPlayerMP['SnowBlitzz'/960, l='world189', x=164.45, y=70.00, z=-133.84]: null
java.lang.NullPointerException
	at com.snowblitzz.BackpackUpgrade.commands.UpgradeBP.execute(UpgradeBP.java:39) ~[UpgradeBP.class:?]
	at org.spongepowered.api.command.spec.CommandSpec.process(CommandSpec.java:359) ~[CommandSpec.class:1.10.2-2281-5.2.0-BETA-2274]
	at org.spongepowered.api.command.dispatcher.SimpleDispatcher.process(SimpleDispatcher.java:336) ~[SimpleDispatcher.class:1.10.2-2281-5.2.0-BETA-2274]
	at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:291) ~[SpongeCommandManager.class:1.10.2-2281-5.2.0-BETA-2274]
	at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:1083) ~[bd.class:?]
	at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:913) ~[me.class:?]
	at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:892) ~[me.class:?]
	at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) ~[im.class:?]
	at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) ~[im.class:?]
	at org.spongepowered.common.network.PacketUtil.lambda$onProcessPacket$0(PacketUtil.java:157) ~[PacketUtil.class:1.10.2-2281-5.2.0-BETA-2274]
	at org.spongepowered.common.event.tracking.CauseTracker.switchToPhase(CauseTracker.java:160) [CauseTracker.class:1.10.2-2281-5.2.0-BETA-2274]
	at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:156) [PacketUtil.class:1.10.2-2281-5.2.0-BETA-2274]
	at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$zjh000(SourceFile:539) [fl$1.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [fl$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_102]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_102]
	at net.minecraft.util.Util.func_181617_a(SourceFile:45) [h.class:?]
	at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:241) [SpongeImplHooks.class:1.10.2-2281-5.2.0-BETA-2274]
	at net.minecraft.server.MinecraftServer.redirect$onRun$zhn000(MinecraftServer.java:3928) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668) [MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_102]