org.bukkit.command.CommandException: Unhandled exception executing command 'dxl' in plugin DungeonsXL v0.10-SNAPSHOT

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org.bukkit.command.CommandException: Unhandled exception executing command 'dxl' in plugin DungeonsXL v0.10-SNAPSHOT	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1165)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1000)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[?:1.8.0_66]	at java.util.concurrent.FutureTask.run(Unknown Source)[?:1.8.0_66]	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:772)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:711)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:614)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at java.lang.Thread.run(Unknown Source)[?:1.8.0_66]Caused by: java.lang.NullPointerException: null value in entry: skull-owner=null	at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:33)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:135)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:206)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaSkull.serialize(CraftMetaSkull.java:181)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaItem.serialize(CraftMetaItem.java:850)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSerializable.representData(YamlRepresenter.java:33)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSerializable.representData(YamlRepresenter.java:35)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representSequence(BaseRepresenter.java:133)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentArray.representData(SafeRepresenter.java:202)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSection.representData(YamlRepresenter.java:23)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresenter.java:64)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:242)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:206)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.yaml.snakeyaml.Yaml.dump(Yaml.java:181)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConfiguration.java:40)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:103)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	at io.github.dre2n.dungeonsxl.player.DSavePlayer.save(DSavePlayer.java:142)[?:?]	at io.github.dre2n.dungeonsxl.player.DSavePlayer.<init>(DSavePlayer.java:62)[?:?]	at io.github.dre2n.dungeonsxl.player.DPlayer.<init>(DPlayer.java:75)[?:?]	at io.github.dre2n.dungeonsxl.command.EditCommand.onExecute(EditCommand.java:35)[?:?]	at io.github.dre2n.dungeonsxl.listener.CommandListener.onCommand(CommandListener.java:50)[?:?]	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)[PaperSpigot.jar:git-PaperSpigot-c725b9c-12698ea]	... 15 more