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java.lang.NullPointerException: 	at net.slipcor.pvparena.modules.powerups.PowerupManager.isPowerup(PowerupManager.java:325)	at net.slipcor.pvparena.modules.powerups.PowerupManager.onPlayerPickupItem(PowerupManager.java:372)	at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor339.execute(Unknown Source)	at org.bukkit.plugin.EventExecutor$1.execute(EventExecutor.java:44)	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:74)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502)	at net.minecraft.server.v1_10_R1.EntityArrow.d(EntityArrow.java:453)	at net.minecraft.server.v1_10_R1.EntityHuman.c(EntityHuman.java:412)	at net.minecraft.server.v1_10_R1.EntityHuman.n(EntityHuman.java:404)	at net.minecraft.server.v1_10_R1.EntityLiving.m(EntityLiving.java:1840)	at net.minecraft.server.v1_10_R1.EntityHuman.m(EntityHuman.java:156)	at net.minecraft.server.v1_10_R1.EntityPlayer.k_(EntityPlayer.java:257)	at net.minecraft.server.v1_10_R1.PlayerConnection.E_(PlayerConnection.java:139)	at net.minecraft.server.v1_10_R1.NetworkManager.a(NetworkManager.java:233)	at net.minecraft.server.v1_10_R1.ServerConnection.c(ServerConnection.java:152)	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:886)	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:404)	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:725)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:624)	at java.lang.Thread.run(Thread.java:745)