`setLowLODElement` might crash if LLOD Element is ``Building``

[PlatinMTA]

Describe the bug

This didn't happen before r26804. Basically doing something like:

local b = createBuilding(5427, 2170.9765625, -1461.125, 25.0859375, 0, 0, 0, 0)
local bLOD = createBuilding(5581, 2170.9765625, -1461.125, 25.0859375, 0, 0, 0, 0)
setLowLODElement(b, bLOD)

Could crash a client. I say could because I was able to reproduce it just fine while loading a custom gamemode, but then I just couldn't reproduce it by using runcode. Anyways setLowLODElement is not intended to work with buildings, you need to use an object instead, but it shouldn't crash either. Maybe a warning would be nice.

Created buildings can have LOD models. The procedure is as follows: spawn the LOD building using createBuilding, then use setLowLODElement to associate it with the non-LOD building element you created beforehand. LOD model distance changed with engineSetModelLODDistance works for buildings.

Doing it the intended way yields no crashes

local b = createBuilding(5427, 2170.9765625, -1461.125, 25.0859375, 0, 0, 0, 0)
local bLOD = createObject(5581, 2170.9765625, -1461.125, 25.0859375, 0, 0, 0, true)
setLowLODElement(b, bLOD)

Steps to reproduce

local b = createBuilding(5427, 2170.9765625, -1461.125, 25.0859375, 0, 0, 0, 0)
local bLOD = createBuilding(5581, 2170.9765625, -1461.125, 25.0859375, 0, 0, 0, 0)
setLowLODElement(b, bLOD)

This may crash your client.

Version

Client: Multi Theft Auto v1.7-untested-26804

Additional context

https://discord.com/channels/801330706252038164/1289708691830083775/1538727847982534739

Relevant log output

Version = 1.7-untested-26804.0.000
Time = Mon Aug 17 03:46:00 2026
Module = C:\Program Files (x86)\MTA San Andreas 1.7\mods\deathmatch\client.dll
Code = 0xC0000005
Offset = 0x00034C9B

EAX=00000000  EBX=4728FDE0  ECX=00000000  EDX=700C8858  ESI=4728FDE0
EDI=00000000  EBP=0177F49C  ESP=0177F490  EIP=6FD54C9B  FLG=00010246
CS=0023   DS=002B  SS=002B  ES=002B   FS=0053  GS=002B

InvalidParameterCount = 0
CrashZone = 0
ThreadId = 4872


Precise crash time: 2026-08-17 03:46:00.314
Exception Type: SEH:AccessViolation
Exception: Access Violation - Invalid memory access
Resolved Module Path: C:\Program Files (x86)\MTA San Andreas 1.7\mods\deathmatch\client.dll
Resolved Module Base: client.dll
Resolved Module Offset: 0x00034C9B
Additional Info: Allocation telemetry: requested=0 bytes (no tagged context available)
CrashTelemetry::Scope annotations: none executed on this thread before crash; instrument entry points to capture context.

Fatal Exception: Yes
Stack trace:
  client.dll+0x34C9B [0x6FD54C9B]
  client.dll+0x34C45 [0x6FD54C45]
  client.dll+0x110169 [0x6FE30169]
  client.dll+0x181959 [0x6FEA1959]
  client.dll+0x18294B [0x6FEA294B]
  client.dll+0x181398 [0x6FEA1398]
  client.dll+0x26EBE0 [0x6FF8EBE0]
  client.dll+0x280763 [0x6FFA0763]
  client.dll+0x26E5EC [0x6FF8E5EC]
  client.dll+0x264843 [0x6FF84843]
  client.dll+0x26EDB8 [0x6FF8EDB8]
  client.dll+0x26E780 [0x6FF8E780]
  client.dll+0x265460 [0x6FF85460]
  client.dll+0x13940F [0x6FE5940F]
  client.dll+0x11F0A7 [0x6FE3F0A7]
  client.dll+0x22D0FB [0x6FF4D0FB]
  client.dll+0x13A92E [0x6FE5A92E]
  client.dll+0x137629 [0x6FE57629]
  client.dll+0x5394C [0x6FD7394C]
  client.dll+0x52A11 [0x6FD72A11]
  core.dll+0xAAB6D [0x7445AB6D]
  core.dll+0x127C1A [0x744D7C1A]
  core.dll+0x1390F7 [0x744E90F7]
  gta_sa.exe+0x3F9B12 [0x7F9B12]
  gta_sa.exe+0x3FB1C3 [0x7FB1C3]


Reason: Access Violation - Invalid memory access at client.dll+0x00034C9B (ThreadId=4872)

Security Policy

• I have read and understood the Security Policy and this issue is not security related.