ServerBooster error

[00:10:04] [Server thread/ERROR]: Error occurred while disabling ServerBooster v1.0-SNAPSHOT (Is it up to date?)
java.lang.NullPointerException: null
	at dev.lone.serverbooster.Main.onDisable(Unknown Source) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:265) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:373) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:453) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:420) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:467) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:381) ~[patched_1.14.4.jar:git-Paper-186]
	at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:474) ~[patched_1.14.4.jar:git-Paper-186]
	at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:290) ~[patched_1.14.4.jar:git-Paper-186]
	at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:870) ~[patched_1.14.4.jar:git-Paper-186]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]