Campaign crash on loading location due to two items having duplicate ID (AbandonedOutpostMission)

[Draconis13]

Disclaimers

• I have searched the issue tracker to check if the issue has already been reported.
• My issue happened while using mods.

What happened?

Transition to location and upon loading up new location get an error of Failed to Spawn Item/Human/Subpart/wall because it has the duplicate ID of another Item/Human/Subpart/Wall and the server crashes. This has been occurring with alarming frequency on both Vanilla and modded servers though it seems more common on Modded due to additional items and NPC's.

I have been trying to troubleshoot this for various people over the last couple of months and have now been having it happen on a modded server. Last time it was on a vanilla server and an Oxygentank had the same ID as a Human and now its a Human has the same ID as a rockwall. This problem seems to be set at campaign creation and people have been attempting to navigate around locations that cause this bug by using backup saves until they encounter another instance. Once you have located one it is infinitely repeatable and will be the same error every time you attempt to level transition to that location/station/whatever.

This has occurred so often that on The Buoy we had two campaigns within 4 days of each other each have this. In one instance it was an Oxygenbottle and could not be fixed requiring the campaign be restarted on another it was a modded gun and removing the weapon mod sharing the ID allowed the save to be loaded as the item with invalid ID was now removed and the campaign progress to the end. On my current game I was able to make it three jumps into the Europan ridge before I hit a station with a Human and Rockwall both sharing the same ID, and will either have to restart or navigate around the location if I want to continue the campaign, until I hit another of these bugged locations.

Reproduction steps

Start a campaign with or without mods and navigate randomly across the map. A location with an invalid item sharing duplicate ID's has a chance to occur at any location upon loading. This location remains bugged and if you return after world steps have taken place it will still give the same ID error.

Bug prevalence

Happens regularly

Single player or multiplayer?

Other

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Happens with alarmingly frequency in all Campaigns single or multiplayer with or without mods.

Version

v1.7.7.0 (Winter Update)

-

No response

Which operating system did you encounter this bug on?

Windows

Relevant error messages and crash reports

Error while reading a message from server. 
ID 3274 is taken by Rock Cave Wall (Horizontal)
   at Barotrauma.Entity..ctor(Submarine submarine, UInt16 id) in <DEV>/Barotrauma/BarotraumaShared/SharedSource/Map/Entity.cs:line 127
   at Barotrauma.Character..ctor(CharacterPrefab prefab, Vector2 position, String seed, CharacterInfo characterInfo, UInt16 id, Boolean isRemotePlayer, RagdollParams ragdollParams, Boolean spawnInitialItems) in <DEV>/Barotrauma/BarotraumaShared/SharedSource/Characters/Character.cs:line 1388
   at Barotrauma.Character.Create(CharacterPrefab prefab, Vector2 position, String seed, CharacterInfo characterInfo, UInt16 id, Boolean isRemotePlayer, Boolean hasAi, Boolean createNetworkEvent, RagdollParams ragdoll, Boolean spawnInitialItems) in <DEV>/Barotrauma/BarotraumaShared/SharedSource/Characters/Character.cs:line 1384
   at Barotrauma.Character.ReadSpawnData(IReadMessage inc) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Characters/CharacterNetworking.cs:line 642
   at Barotrauma.AbandonedOutpostMission.ClientReadInitial(IReadMessage msg) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Events/Missions/AbandonedOutpostMission.cs:line 41
   at Barotrauma.Networking.GameClient.ReadStartGameFinalize(IReadMessage inc) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs:line 1009
   at Barotrauma.Networking.GameClient.ReadDataMessage(IReadMessage inc) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs:line 800
   at Barotrauma.Networking.LidgrenClientPeer.HandleDataMessage(NetIncomingMessage lidgrenMsg) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Networking/Primitives/Peers/LidgrenClientPeer.cs:line 152
   at Barotrauma.Networking.LidgrenClientPeer.Update(Single deltaTime) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Networking/Primitives/Peers/LidgrenClientPeer.cs:line 129
   at Barotrauma.Networking.GameClient.Update(Single deltaTime) in <DEV>/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs:line 515

[Draconis13]

Even more of these coming in.

[Draconis13]

Seems to be the game is assigning Item and Character ID's separate from each other and under certain random circumstances it can assign the same ID to an Item and a Character due to overlap, especially at stations.

[Regalis11]

Thank you for the report! Do you by any chance have any save files where this occurs? Those'd help us a lot in reproducing and diagnosing the issue. Thanks and sorry for the inconvenience!

[Draconis13]

Save file for our 2025 campaign which stalled due to duplicate ID bug, attempts to load and crashes

https://www.dropbox.com/scl/fi/uzy7duh0g6dpywn01asrt/2025.save?rlkey=58uflgyhakwd05b0a8aouht0s&dl=0

Modlist in steam collection format used for this save.

https://steamcommunity.com/sharedfiles/filedetails/?id=3062356746

I put out a message out to people to see if I can get one of the saves from a campaign without any mods being run on it as that would be easier to sort through I am sure.

[Regalis11]

Thank you! I unfortunately couldn't repro the issue in this save despite going through a bunch of locations with abandoned outpost missions (which all the error messages here seem to be coming from). I have a feeling it could have something to do with the IDs items in the players' inventories conflicting with the characters spawned by the outpost missions - although I can't think of why or how that would happen, since the server should find a free ID for the characters.

If you manage to find a vanilla save where this occurs, that could hopefully give us more clues for diagnosing this. Sorry for the trouble again. :/ But in any case, I'll do some more debugging and see if I can find a way to induce this in that modded save.

[Draconis13]

Its normally on regular outposts vs abandoned and its often things static items like submarine part, wall horizontal and rockwall as often as it is vanilla items like an oxygen tank or a random modded item.

Trying to dock at Sparti Linea Quarry

I have had/seen this on Vanilla servers without mods I will see if I can get a save file from one of them as well. When it happens with a modded item we have been able to remove/readd the mod but if its an oxygen bottle its no joy and have to back up and go around the station.