A bug about disbale server

[sumdream]

[08:55:25] [Server thread/INFO]: [SkillAPI] Disabling SkillAPI v3.37
[08:55:25] [Server thread/ERROR]: Error occurred while disabling SkillAPI v3.37 (Is it up to date?)
java.lang.NullPointerException
at com.rit.sucy.version.VersionPlayer.(VersionPlayer.java:54) ~[?:?]
at com.sucy.skill.data.io.ConfigIO.saveData(ConfigIO.java:63) ~[?:?]
at com.sucy.skill.data.io.ConfigIO.saveAll(ConfigIO.java:82) ~[?:?]
at com.sucy.skill.SkillAPI.onDisable(SkillAPI.java:259) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:323) ~[spigot.jar:git-Spigot-5f38d38-908bca3]
at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:364) [spigot.jar:git-Spigot-5f38d38-908bca3]
at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:424) [spigot.jar:git-Spigot-5f38d38-908bca3]
at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:417) [spigot.jar:git-Spigot-5f38d38-908bca3]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.disablePlugins(CraftServer.java:336) [spigot.jar:git-Spigot-5f38d38-908bca3]
at net.minecraft.server.v1_8_R3.MinecraftServer.stop(MinecraftServer.java:460) [spigot.jar:git-Spigot-5f38d38-908bca3]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:593) [spigot.jar:git-Spigot-5f38d38-908bca3]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_60]
could u fix it