null error after plugin update

Summary

When I updated from 5.0.0 to 5.0.2, I got an error. I wonder why it happens.

Steps to reproduce

Update myticmobs.

Current behavior

When the server is running, the message appears, and there seems to be no problem with the operation.

Intended correct behavior

The message should not appear.

Server log file

[09:25:33 ERROR]: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task
[09:25:33 WARN]: java.lang.NullPointerException: Cannot invoke "io.lumine.mythic.api.adapters.AbstractEntity.isValid()" because "this.entity" is null
[09:25:33 WARN]:        at MythicMobs-5.0.2-SNAPSHOT.jar//io.lumine.mythic.core.mobs.ActiveMob.setupNew(ActiveMob.java:153)
[09:25:33 WARN]:        at MythicMobs-5.0.2-SNAPSHOT.jar//io.lumine.mythic.core.mobs.ActiveMob.lambda$new$0(ActiveMob.java:123)
[09:25:33 WARN]:        at MythicMobs-5.0.2-SNAPSHOT.jar//io.lumine.mythic.utils.Delegates$RunnableToSupplier.get(Delegates.java:121)
[09:25:33 WARN]:        at MythicMobs-5.0.2-SNAPSHOT.jar//io.lumine.mythic.utils.promise.LuminePromise$SupplyRunnable.run(LuminePromise.java:654)
[09:25:33 WARN]:        at MythicMobs-5.0.2-SNAPSHOT.jar//io.lumine.mythic.utils.tasks.LumineExecutors$SchedulerWrappedRunnable.run(LumineExecutors.java:70)
[09:25:33 WARN]:        at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftTask.run(CraftTask.java:101)
[09:25:33 WARN]:        at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483)
[09:25:33 WARN]:        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1584)
[09:25:33 WARN]:        at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:519)
[09:25:33 WARN]:        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1507)
[09:25:33 WARN]:        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1294)
[09:25:33 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$1(MinecraftServer.java:322)
[09:25:33 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)