Crash: mod-autobalance crash in _IsSummonCloneOfSummoner during respawn of transport NPC.

[Fabian-Evolved]

Current Behaviour

The worldserver crashed with a C0000005 ACCESS_VIOLATION after a creature respawn was triggered.

The crash occurred inside mod-autobalance while AutoBalance was processing creature level/attribute logic during Creature::Respawn().

8bf01db8498f_worldserver.exe_[26-5_6-13-9].dmp
8bf01db8498f_worldserver.exe_[26-5_6-13-9].txt

Relevant crash path:

Object::GetUInt32Value()
AutoBalance_AllCreatureScript::_isSummonCloneOfSummoner()
AutoBalance_AllCreatureScript::ModifyCreatureAttributes()
AutoBalance_AllCreatureScript::OnCreatureSelectLevel()
Creature::SelectLevel()
Creature::Respawn()
misc_commandscript::HandleRespawnCommand()

The creature involved in the crash log was:

Entry: 31708
Name: Deathguard Barth
SubName: The Cloudkisser
SpawnId / guid: 142827

Database checks show that this NPC is spawned on map 610 with local transport-style coordinates:

guid: 142827
id: 31708
map: 610
zoneId: 0
areaId: 0
position_x: -2.74581
position_y: -1.47146
position_z: -17.7765
orientation: 4.67712

Additional database checks showed multiple NPCs with the subname "The Cloudkisser" on map 610, suggesting this creature is part of a zeppelin/transport context rather than a dungeon, or raid creature.

The crash log also showed a non-null summoner pointer, but the internal object value arrays were unreadable:

m_int32Values  = <Unable to read memory>
m_uint32Values = <Unable to read memory>
m_floatValues  = <Unable to read memory>
m_inWorld = 0

This suggests AutoBalance may be attempting to read object fields from a creature/unit that is no longer in a safe world state, possibly related to transport handling, grid unload/reload state, or stale summon/summoner references.

Expected Behaviour

AutoBalance should not crash when a transport NPC or transport-bound creature is respawned.

AutoBalance should safely ignore or return early when handling creatures, summons, or summoners that are:

• null
• not in world
• attached to a transport
• on transport maps
• partially removed or unloaded
• unsafe to inspect as summon/summoner references

The server should continue running normally, and the respawn command should complete without causing an access violation.

Steps to reproduce the problem

1. Use AzerothCore rev. 8bf01db8498f 2026-05-24 04:18:34 -0300 (master branch) (Win64, RelWithDebInfo, Static) with mod-autobalance enabled.
2. Locate the transport NPC Deathguard Barth:

• Entry: 31708
• Name: Deathguard Barth
• SubName: The Cloudkisser
• guid: 142827
• map: 610

3. Trigger a creature respawn involving this NPC or transport NPCs from The Cloudkisser.
4. AutoBalance processes the creature through OnCreatureSelectLevel() during Creature::Respawn().
5. In the crash case, AutoBalance reached _IsSummonCloneOfSummoner() and eventually calls Object::GetUInt32Value() on an unsafe object, causing an ACCESS_VOILATION.

Note: The crash may be state-dependent. After the original crash, manually going to the zeppelin and forcing a respawn again did not immediately reproduce the crash. This may depend on transport state, grid loading/unloading, creature world state, or stale summon/summoner data.

Extra Notes

The crash appears to be caused by mod-autobalance processing a transport/zeppelin NPC during respawn handling, then attempting to inspect summon/summoner data without enough safety checks.

This does not appear to be a normal database spawn issue or a regular instance creature issue. The affected NPC is part of The Cloudkisser transport crew, which is located outside dungeons/raids.

AutoBalance Debug Commands

No response

AC rev. hash/commit

AzerothCore rev. 8bf01db8498f 2026-05-24 04:18:34 -0300 (master branch) (Win64, RelWithDebInfo, Static)

Operating system

Windows 11

Custom changes or Modules

List of enabled modules:
|- mod-1v1-arena
|- mod-ah-bot-plus
|- mod-ale
|- mod-aoe-loot
|- mod-assistant
|- mod-autobalance
|- mod-breaking-news-override
|- mod-easy-respawn
|- mod-fly-in-old-world
|- mod-junk-to-gold
|- mod-npc-services
|- mod-profession-experience
|- mod-starter-guild