java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.bukkit.inventory.ItemStack.(ItemStack.java:94)
at io.github.yannici.bedwars.Villager.MerchantCategory.loadCategories(MerchantCategory.java:117)
at io.github.yannici.bedwars.Game.Game.loadItemShopCategories(Game.java:1046)
at io.github.yannici.bedwars.Game.Game.start(Game.java:232)
at io.github.yannici.bedwars.Game.GameLobbyCountdown.run(GameLobbyCountdown.java:145)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723)
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
at java.lang.Thread.run(Thread.java:745)

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