Packaging error 5.4.4 Ensure condition failed: Materials.IsValidIndex(Section.MaterialIndex)

Hey, I recently migrated a project from Unreal Engine version 5.3 to version 5.4.4. While I was able to resolve several issues encountered during the migration, one problem remains that prevents me from packaging the project.

The error message is as follows:
LogOutputDevice: Error: Ensure condition failed: Materials.IsValidIndex(Section.MaterialIndex) [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\SkeletalMeshLODModel.cpp] [Line: 1499]

Please, I am really pressed for time, and this issue is preventing us from moving forward. Your assistance would be greatly appreciated.