# Scene graph prefab or component corruption with error "Serial size mismatch" causes Fortnite to hard crash

**URL:** <https://forums.unrealengine.com/t/scene-graph-prefab-or-component-corruption-with-error-serial-size-mismatch-causes-fortnite-to-hard-crash/2729386>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, fixed, fortnite\
**Created:** [June 17, 2026, 6:06pm UTC](https://forums.unrealengine.com/t/scene-graph-prefab-or-component-corruption-with-error-serial-size-mismatch-causes-fortnite-to-hard-crash/2729386 "2026-06-17T18:06:01Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Dallan-MT](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/dallan-mt/32/1149461_2.png) [@Dallan-MT](https://forums.unrealengine.com/u/Dallan-MT)\
**Post date:** [June 22, 2026, 9:56am UTC](https://forums.unrealengine.com/t/scene-graph-prefab-or-component-corruption-with-error-serial-size-mismatch-causes-fortnite-to-hard-crash/2729386/8 "2026-06-22T09:56:40Z")

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Hey all, thanks for the reports. Can we get full logs please? Appreciate the excerpts but please grab the full Fortnite client and UEFN editor logs so we have the full picture - [How to get your Fortnite logs](https://forums.unrealengine.com/t/how-to-get-your-fortnite-logs/682382)

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