onDespawn isnt working

i have the same problem with ~onDespawn and ~onDeath triggers the console log:

[06.09 10:36:07] [Server] [Server thread/ERROR]: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task [06.09 10:36:07] [Server] [Server thread/WARN]: java.lang.NullPointerException [06.09 10:36:07] [Server] [Server thread/WARN]: at io.lumine.xikage.mythicmobs.mobs.ActiveMob.setups(ActiveMob.java:131) [06.09 10:36:07] [Server] [Server thread/WARN]: at io.lumine.xikage.mythicmobs.mobs.ActiveMob.lambda$new$0(ActiveMob.java:122) [06.09 10:36:07] [Server] [Server thread/WARN]: at io.lumine.xikage.mythicmobs.utils.Delegates$RunnableToSupplier.get(Delegates.java:121) [06.09 10:36:07] [Server] [Server thread/WARN]: at io.lumine.xikage.mythicmobs.utils.promise.LuminePromise$SupplyRunnable.run(LuminePromise.java:654) [06.09 10:36:07] [Server] [Server thread/WARN]: at io.lumine.xikage.mythicmobs.utils.tasks.LumineExecutors$SchedulerWrappedRunnable.run(LumineExecutors.java:70) [06.09 10:36:07] [Server] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:81) [06.09 10:36:07] [Server] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:400) [06.09 10:36:07] [Server] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.b(MinecraftServer.java:1179) [06.09 10:36:07] [Server] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:394) [06.09 10:36:07] [Server] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1127) [06.09 10:36:07] [Server] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:966) [06.09 10:36:07] [Server] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$0(MinecraftServer.java:273) [06.09 10:36:07] [Server] [Server thread/WARN]: at java.lang.Thread.run(Thread.java:748)

Please include your spigot/paper version