# Engine Crashes when duplicating a specific map and throws "Assertion failed: LightMapCoordinateIndex \>= 0

**URL:** <https://forums.unrealengine.com/t/engine-crashes-when-duplicating-a-specific-map-and-throws-assertion-failed-lightmapcoordinateindex-0/575939>\
**Category:** World Creation\
**Tags:** World-Building, unreal-engine, UE5-0, question\
**Created:** [June 7, 2022, 6:51am UTC](https://forums.unrealengine.com/t/engine-crashes-when-duplicating-a-specific-map-and-throws-assertion-failed-lightmapcoordinateindex-0/575939 "2022-06-07T06:51:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ezcoal\_1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Ezcoal\_1](https://forums.unrealengine.com/u/Ezcoal_1)\
**Post date:** [June 7, 2022, 6:51am UTC](https://forums.unrealengine.com/t/engine-crashes-when-duplicating-a-specific-map-and-throws-assertion-failed-lightmapcoordinateindex-0/575939/1 "2022-06-07T06:51:42Z")

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[QuantumLeap - duplicating map.txt](https://forums.unrealengine.com/uploads/short-url/p60aeRDHNhspLIabm0dyi6KKzi3.txt) (4.3 KB)

Please check the logs attached