> [01:04:18 ERROR]: Could not pass event BlockBreakEvent to InterstellarCore v1.0.1a
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[server.jar:git-Spigot-f09662d-494eef4]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:66) ~[server.jar:git-Spigot-f09662d-494eef4]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:507) ~[server.jar:git-Spigot-f09662d-494eef4]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:492) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.PlayerInteractManager.breakBlock(PlayerInteractManager.java:292) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.PlayerInteractManager.a(PlayerInteractManager.java:219) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1160) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.PacketPlayInBlockDig.a(SourceFile:40) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.PacketPlayInBlockDig.a(SourceFile:10) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:9) ~[server.jar:git-Spigot-f09662d-494eef4]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_202]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_202]
at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:896) [server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [server.jar:git-Spigot-f09662d-494eef4]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
Caused by: java.lang.IllegalArgumentException: Cannot drop air
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.EntityItem.setItemStack(EntityItem.java:375) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.minecraft.server.v1_13_R2.EntityItem.<init>(EntityItem.java:40) ~[server.jar:git-Spigot-f09662d-494eef4]
at org.bukkit.craftbukkit.v1_13_R2.CraftWorld.dropItem(CraftWorld.java:313) ~[server.jar:git-Spigot-f09662d-494eef4]
at org.bukkit.craftbukkit.v1_13_R2.CraftWorld.dropItemNaturally(CraftWorld.java:329) ~[server.jar:git-Spigot-f09662d-494eef4]
at net.Indyuce.rpg.listener.BlockListener.a(BlockListener.java:47) ~[InterstellarCore.jar:?]
at sun.reflect.GeneratedMethodAccessor427.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_202]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_202]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:312) ~[server.jar:git-Spigot-f09662d-494eef4