"[string "?"]:1344: attempt to index a nil value" when changing startup category

[ParzivalWolfram]

When changing startup category in Settings, trying to advance past "Recently Played" causes momentary screen corruption, then the error in the title. (Trying to press X to restart at this point results in "[string "?"]:729: Network is already inited." as well.)

[ericitaquera]

Found a solution.

This is error is due to no custom collections existing.

Try to create a new collection.

See RetroFlow Launcher 6.0.0 release notes:

https://github.com/jimbob4000/RetroFlow-Launcher/releases/tag/v6.0.0

Regards.