# Crash with migrated UE5.1 worldpartition project to UE5.4 at the openning

**URL:** <https://forums.unrealengine.com/t/crash-with-migrated-ue5-1-worldpartition-project-to-ue5-4-at-the-openning/1918310>\
**Category:** Feedback & Requests\
**Tags:** unreal-engine, question\
**Created:** [June 27, 2024, 8:41am UTC](https://forums.unrealengine.com/t/crash-with-migrated-ue5-1-worldpartition-project-to-ue5-4-at-the-openning/1918310 "2024-06-27T08:41:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![AXL3D2021](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AXL3D2021](https://forums.unrealengine.com/u/AXL3D2021)\
**Post date:** [June 27, 2024, 8:41am UTC](https://forums.unrealengine.com/t/crash-with-migrated-ue5-1-worldpartition-project-to-ue5-4-at-the-openning/1918310/1 "2024-06-27T08:41:02Z")

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Hello, after migrating my UE5.1 big worldpartition project to UE5.4, when I try to oppen the new map in UE5.4 I have a crash : “Assertion failed: CellIndex \< CellIndexMax [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\SceneCulling\SceneCulling.h] [Line: 172]”

I need Help!!!