Crashes all the time with lightass scene

yellowborb
Fri, 25 Apr 2025 13:07:16 +0000
Community & Industry Discussion

I have an issue that i saw many times in forums and no one seems to have find any solution to it.

I have a very simple interior scene, with built/baked shadows and lightmaps. If i press play just after the level have been built everything works fine, but if i save, quit Unreal and reopen it, then the press play button will systematically cause a crash with the following error :

Assertion failed: !Cell.Data [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\PrecomputedVolumetricLightmapStreaming.cpp] [Line: 220]

So i came to the conclusion that the problem was maybe is the save of the data but i don’t understand how to solve this. Also, when I reopen the scene, everything seems to displays perfectly fine in “Lit” mode so the lightmaps are there, i really don’t understand.

My drivers are up to date,I already tried reinstall
I have a RTX 4080.

I appreciate any help.

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