System.ArgumentOutOfRangeException - SMSG_UPDATE_OBJECT

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Got the following error when it was parsing SMSG_UPDATE_OBJECT for the creature spawns when I parsed a sniff from 5.3.0 16992

Detected build: V5_3_0_16992 Detected locale: enUS Targeted database: BattleForAzeroth

System.ArgumentOutOfRangeException Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index') The actual value was -1. at System.Collections.Generic.SortedList2.GetKey(Int32 index) at System.Collections.Generic.SortedList2.KeyList.get_Item(Int32 index) at WowPacketParser.Enums.Version.UpdateFields.GetUpdateFieldName[T](Int32 field) in D:\WowPacketParser-master\WowPacketParser\Enums\Version\UpdateFields.cs:line 165 at WowPacketParser.Parsing.Parsers.UpdateHandler.ReadDynamicValuesUpdateBlock(Packet packet, ObjectType type, Object index, Boolean isCreating, Dictionary`2 oldValues) in D:\WowPacketParser-master\WowPacketParser\Parsing\Parsers\UpdateHandler.cs:line 487 at WowPacketParser.Parsing.Parsers.UpdateHandler.ReadDynamicValuesUpdateBlockOnCreate(Packet packet, ObjectType type, Object index) in D:\WowPacketParser-master\WowPacketParser\Parsing\Parsers\UpdateHandler.cs:line 113 at WowPacketParserModule.V5_3_0_16981.Parsers.UpdateHandler.ReadCreateObjectBlock(Packet packet, WowGuid guid, UInt32 map, Object index) in D:\WowPacketParser-master\WowPacketParserModule.V5_3_0_16981\Parsers\UpdateHandler.cs:line 56 at WowPacketParserModule.V5_3_0_16981.Parsers.UpdateHandler.HandleUpdateObject(Packet packet) in D:\WowPacketParser-master\WowPacketParserModule.V5_3_0_16981\Parsers\UpdateHandler.cs:line 39 at WowPacketParser.Parsing.Handler.Parse(Packet packet, Boolean isMultiple) in D:\WowPacketParser-master\WowPacketParser\Parsing\Handler.cs:line 149