[20:32:37 WARN]: java.lang.NullPointerException
[20:32:37 WARN]:        at me.takahatashun.hypermine.ultils.ItemsLevelHandler.getLevel(ItemsLevelHandler.java:51)
[20:32:37 WARN]:        at me.takahatashun.hypermine.ultils.ItemsLevelHandler.hasLevel(ItemsLevelHandler.java:42)
[20:32:37 WARN]:        at me.takahatashun.hypermine.listener.UpgradeItem.onClick(UpgradeItem.java:55)
[20:32:37 WARN]:        at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
[20:32:37 WARN]:        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[20:32:37 WARN]:        at java.lang.reflect.Method.invoke(Unknown Source)
[20:32:37 WARN]:        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)
[20:32:37 WARN]:        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
[20:32:37 WARN]:        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500)
[20:32:37 WARN]:        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1891)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:33)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:10)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13)
[20:32:37 WARN]:        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[20:32:37 WARN]:        at java.util.concurrent.FutureTask.run(Unknown Source)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679)
[20:32:37 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577)
[20:32:37 WARN]:        at java.lang.Thread.run(Unknown Source)