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

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java.lang.NullPointerException: null value in entry: skull-owner=null	at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:33)	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:135)	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:206)	at org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaSkull.serialize(CraftMetaSkull.java:181)	at org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaItem.serialize(CraftMetaItem.java:850)	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSerializable.representData(YamlRepresenter.java:33)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSerializable.representData(YamlRepresenter.java:35)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.representSequence(BaseRepresenter.java:133)	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentArray.representData(SafeRepresenter.java:202)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSection.representData(YamlRepresenter.java:23)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresenter.java:64)	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:242)	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:206)	at org.yaml.snakeyaml.Yaml.dump(Yaml.java:181)	at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConfiguration.java:40)	at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:103)	at io.github.dre2n.dungeonsxl.player.DSavePlayer.save(DSavePlayer.java:142)	at io.github.dre2n.dungeonsxl.player.DSavePlayer.(DSavePlayer.java:62)	at io.github.dre2n.dungeonsxl.player.DPlayer.(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)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641)	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1165)	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1000)	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45)	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1)	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:772)	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378)	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:711)	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:614)	at java.lang.Thread.run(Unknown Source)