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java.lang.NullPointerException: 	at org.yaml.snakeyaml.emitter.Emitter.expectNode(Emitter.java:400)	at org.yaml.snakeyaml.emitter.Emitter.access$1600(Emitter.java:62)	at org.yaml.snakeyaml.emitter.Emitter$ExpectBlockMappingSimpleValue.expect(Emitter.java:641)	at org.yaml.snakeyaml.emitter.Emitter.emit(Emitter.java:216)	at org.yaml.snakeyaml.serializer.Serializer.serializeNode(Serializer.java:181)	at org.yaml.snakeyaml.serializer.Serializer.serializeNode(Serializer.java:205)	at org.yaml.snakeyaml.serializer.Serializer.serializeNode(Serializer.java:206)	at org.yaml.snakeyaml.serializer.Serializer.serializeNode(Serializer.java:206)	at org.yaml.snakeyaml.serializer.Serializer.serialize(Serializer.java:112)	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:243)	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:39)	at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:68)	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at skinsrestorer.shared.utils.ReflectionUtil.invokeMethod(ReflectionUtil.java:96)	at skinsrestorer.shared.utils.YamlConfig.save(YamlConfig.java:119)	at skinsrestorer.shared.utils.YamlConfig.set(YamlConfig.java:47)	at skinsrestorer.shared.storage.SkinStorage.removePlayerSkin(SkinStorage.java:47)	at skinsrestorer.shared.storage.SkinStorage.getPlayerSkin(SkinStorage.java:185)	at skinsrestorer.shared.storage.SkinStorage.getOrCreateSkinForPlayer(SkinStorage.java:207)	at skinsrestorer.bukkit.listeners.SkinsPacketHandler.write(SkinsPacketHandler.java:75)	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:658)	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:716)	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:706)	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:741)	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:895)	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:240)	at net.minecraft.server.v1_10_R1.NetworkManager$4.run(NetworkManager.java:200)	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:380)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)	at java.lang.Thread.run(Thread.java:745)