Error during dungeon (Is this error duplicate?)

[Kustale]

Describe the bug

Error while progressing in Madrakan Spire dungeon.

To Reproduce

1. Enter the Madrakan Spire dungeon.
2. Progress.

Expected behavior

Crash. (However, unlike the previous error, the server does not turn off.)

Screenshots

Stack trace of the error

[00:29:21] [ERR] FieldManager: System.NullReferenceException: Object reference not set to an instance of an object.
at MapleServer2.Triggers.TriggerContext.MonsterDead(Int32[] spawnPointIds, Boolean arg2) in D:\MapleServer2-First\MapleServer2\Triggers\TriggerConditions.cs:line 105
at Maple2.Trigger._52100042_qd._barricade.StateCreate_barricade.Execute()
at MapleServer2.Triggers.TriggerScript.Next() in D:\MapleServer2-First\MapleServer2\Triggers\TriggerScript.cs:line 29
at MapleServer2.Managers.FieldManager.b__91_0() in D:\MapleServer2-First\MapleServer2\Managers\FieldManager.cs:line 1487

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