EpicFurnaces Storage Error

[14:02:05] [Server thread/ERROR]: Error occurred while disabling EpicFurnaces v4.5.2 (Is it up to date?)
java.lang.NullPointerException: null
        at com.songoda.epicfurnaces.storage.types.StorageYaml.copyFile(StorageYaml.java:144) ~[?:?]
        at com.songoda.epicfurnaces.storage.types.StorageYaml.makeBackup(StorageYaml.java:112) ~[?:?]
        at com.songoda.epicfurnaces.storage.types.StorageYaml.doSave(StorageYaml.java:74) ~[?:?]
        at com.songoda.epicfurnaces.EpicFurnaces.saveToFile(EpicFurnaces.java:306) ~[?:?]
        at com.songoda.epicfurnaces.EpicFurnaces.onPluginDisable(EpicFurnaces.java:75) ~[?:?]
        at com.songoda.epicfurnaces.core.SongodaPlugin.onDisable(SongodaPlugin.java:125) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:265) ~[spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:377) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:438) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:430) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.disablePlugins(CraftServer.java:395) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at net.minecraft.server.v1_14_R1.MinecraftServer.stop(MinecraftServer.java:690) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at net.minecraft.server.v1_14_R1.DedicatedServer.stop(DedicatedServer.java:683) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:856) [spigot-1.14.4.jar:git-Spigot-94af569-a3fdef8]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]