Crashes in packaged UE builds

Cesium for Unreal
1

Hello everyone, I’m using Cesium for UE and having crashes in packaged shipping builds. The crash call stack is as follows:

2026-05-28_114234_076
2026-05-28_114234_0761707×1280 214 KB

Some other informations:
UE version: 5.4.4
OS version: Windows 11
CesiumForUE version: 2.16.1

Should anyone knows anything about this, that will be great. Many thanks.

3

Hey @nieyuuu, welcome to the forum!

Thanks for the crash log, that’s helpful.

This crash is a known bug that’s already been fixed. The null pointer in CesiumGaussianSplatSubsystem::Tick() happens because GetPrimaryWorld() can return null during startup in certain contexts (like packaged builds), and the code wasn’t checking for that.

However some other things you may want to check, I believe the Gaussian Splat subsystem was introduced in Cesium for Unreal v2.24.0, and you mentioned you’re on v2.16.1. Could you double-check which version you actually have installed? The crash stack shows this subsystem is present, so you likely have a newer version than you think. Also, our current releases (v2.24+) only officially support UE 5.5, 5.6, and 5.7. If you’re running the plugin on UE 5.4.4, you may hit other compatibility issues beyond this crash.

Your options:

  1. Update Unreal Engine to 5.5+ and grab the latest plugin from GitHub (which includes the fix for this crash, merged in PR #1844).
  2. Roll back the plugin to v2.23.0 or earlier, which doesn’t have the Gaussian Splat subsystem and won’t hit this crash. If you download through Fab on UE 5.4, you should receive an older compatible version automatically.

The fix will also ship in the official June 2026 release for UE 5.5+.

Let me know if you need help with anything else!

4

Hi @darcyvdd , thanks for your reply. I’d like to provide more informations about this crash.

  1. This crash happens in packaged shipping builds. In my project, there is only cesium(3D scene) and some web UI(web view). And after running for about 1hr, the process crashes. So more likely it will be cesium rather than web UI because the crash call stack suggests Mesh Draw Command.
  2. Some of my test PCs will not crash(even runs for days) and other test PCs crash quite offen and soon.
    And I will try the solutions you mentioned. Again many thanks!