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Resolves #9992. Creating new users will make sure to avoid creating duplicate users where the only difference is a casing. Error handling did not handle this correctly, resulting in 500. This is fixed by searching for LowerName in the error handling. Co-authored-by: Raymond Kroon <raymond.kroon@kadaster.nl> Co-authored-by: Gusted <postmaster@gusted.xyz> Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10072 Reviewed-by: Gusted <gusted@noreply.codeberg.org> Co-authored-by: RaymondKroon <raymondkroon@noreply.codeberg.org> Co-committed-by: RaymondKroon <raymondkroon@noreply.codeberg.org>