[20:45:57 WARN]: java.lang.NullPointerException: Cannot invoke "io.lumine.mythic.core.skills.variables.VariableRegistry.clean()" because the return value of "io.lumine.mythic.bukkit.utils.serialization.WrappedJsonFile.get()" is null
[20:45:57 WARN]:        at MythicMobs-5.1.0-SNAPSHOT.jar//io.lumine.mythic.core.skills.variables.VariableManager.save(VariableManager.java:52)
[20:45:57 WARN]:        at MythicMobs-5.1.0-SNAPSHOT.jar//io.lumine.mythic.core.config.ConfigExecutor.save(ConfigExecutor.java:159)
[20:45:57 WARN]:        at MythicMobs-5.1.0-SNAPSHOT.jar//io.lumine.mythic.bukkit.clock.MythicClock.executeSave(MythicClock.java:184)
[20:45:57 WARN]:        at MythicMobs-5.1.0-SNAPSHOT.jar//io.lumine.mythic.bukkit.clock.MythicClock.runSavingClock(MythicClock.java:137)
[20:45:57 WARN]:        at MythicMobs-5.1.0-SNAPSHOT.jar//io.lumine.mythic.bukkit.utils.Delegates$RunnableToConsumer.accept(Delegates.java:93)
[20:45:57 WARN]:        at MythicMobs-5.1.0-SNAPSHOT.jar//io.lumine.mythic.bukkit.utils.Schedulers$LumineTask.run(Schedulers.java:162)
[20:45:57 WARN]:        at org.bukkit.craftbukkit.v1_18_R2.scheduler.CraftTask.run(CraftTask.java:101)
[20:45:57 WARN]:        at org.bukkit.craftbukkit.v1_18_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483)
[20:45:57 WARN]:        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1559)
[20:45:57 WARN]:        at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:522)
[20:45:57 WARN]:        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1483)
[20:45:57 WARN]:        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1247)
[20:45:57 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$1(MinecraftServer.java:321)
[20:45:57 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)