Howto reproduce:

• start from scratch, install the foreman package with any database support (sqlite will do)
• as root, call foreman-rake db:setup : the program fails during the db:seed task, specifically in the 04-admin.rb part (the backtrace stipulates that it can't call dup in NilClass at 04-admin.rb:38)

Cause:

• this is partly related to #14541 because none of ENV['SEED_ADMIN_EMAIL'] nor Setting[:administrator] seem to be valid

As a sidenote, calling foreman-rake db:seed works.