>.... [14:11:25 ERROR]: Could not pass event InventoryClickEvent to BuildBattle v4.2.0
java.lang.NullPointerException: null
at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftMetaSkull.equalsCommon(CraftMetaSkull.java:220) ~[patched_1.15.1.jar:git-Paper-58]
at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemFactory.equals(CraftItemFactory.java:307) ~[patched_1.15.1.jar:git-Paper-58]
at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemFactory.equals(CraftItemFactory.java:294) ~[patched_1.15.1.jar:git-Paper-58]
at org.bukkit.inventory.ItemStack.isSimilar(ItemStack.java:275) ~[patched_1.15.1.jar:git-Paper-58]
at pl.plajer.buildbattle.menus.options.registry.playerheads.PlayerHeadsOption$1.onTargetClick(PlayerHeadsOption.java:61) ~[?:?]
at pl.plajer.buildbattle.menus.options.OptionsMenuHandler.onRegisteredMenuOptionsClick(OptionsMenuHandler.java:84) ~[?:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor471.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.15.1.jar:git-Paper-58]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.15.1.jar:git-Paper-58]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.15.1.jar:git-Paper-58]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:545) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:2328) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.PacketPlayInWindowClick.a(SourceFile:32) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:23) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.MinecraftServer.aZ(MinecraftServer.java:1037) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:1030) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1014) ~[patched_1.15.1.jar:git-Paper-58]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:937) ~[patched_1.15.1.jar:git-Paper-58]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]