Briefing

Debugging a FiveM Ambulance Bug with Logs and Defensive Code

security
by Tack k ·

Patch your defensive loop by ensuring deathPosition is updated on each death event and isolate it from unrelated features.

What to do now

Patch your defensive loop by ensuring deathPosition is updated on each death event and isolate it from unrelated features.

Summary

The article recounts a debugging session for a FiveM ambulance system where a medic carrying a patient would teleport back to the original carry start after dying inside a vehicle. Initial fixes such as FreezeEntityPosition and NetworkRequestControlOfEntity failed, as did a server‑side drop‑here event. The culprit was a defensive loop written weeks earlier to keep dead players at their death position; it stored the death coordinates in a global variable and yanked players back if they moved more than 30 meters. During a carry, the loop mistakenly interpreted the medic’s movement as a teleport and forced the patient back to the stale death location. Logs revealed the old death coordinates (59.18, –772.08, 31.74) and highlighted that the death position broadcast was from a different feature. The fix involved updating the death‑tracking code to capture the current death coordinates and isolating it from unrelated features. The article emphasizes the power of precise logging, the importance of defensive code isolation, and the need to verify event handling when adding new features. It also showcases how a single log line can uncover hidden bugs that manual debugging might miss.

Key changes

  • The bug caused medic carrying a patient to teleport back to original carry start due to old death position broadcast.
  • The death position was captured by a defensive loop for a different feature, not updated during carry.
  • The defensive loop used isDowned flag and deathPosition to yank back if distance >30m.
  • The bug was resolved by identifying that the death position broadcast was stale and not the current death event.
  • The log line "[my_ambulance] death captured at 59.18, -772.08, 31.74" indicated old position.
  • The fix involved updating the death‑tracking code to capture current death coordinates.
  • The issue highlighted the importance of defensive code isolation and proper event handling.
  • The article demonstrates that logs can reveal hidden bugs that manual debugging misses.

Affects

internal enterprise

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