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java.lang.NullPointerException: 	at me.blackvein.quests.util.ItemUtil.getDisplayString(ItemUtil.java:168)	at me.blackvein.quests.prompts.CreateStagePrompt$DeliveryListPrompt.getPromptText(CreateStagePrompt.java:2058)	at org.bukkit.conversations.Conversation.outputNextPrompt(Conversation.java:291)	at org.bukkit.conversations.Conversation.acceptInput(Conversation.java:230)	at org.bukkit.craftbukkit.v1_8_R1.conversations.ConversationTracker.acceptConversationInput(ConversationTracker.java:58)	at org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer.acceptConversationInput(CraftPlayer.java:1033)	at net.minecraft.server.v1_8_R1.PlayerConnection$2.evaluate(PlayerConnection.java:964)	at org.bukkit.craftbukkit.v1_8_R1.util.Waitable.run(Waitable.java:24)	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:700)	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316)	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623)	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526)	at java.lang.Thread.run(Thread.java:745)