Strange array exception after pressing q

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  2. Set additional_settings, current value: {}
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/usr/lib/ruby/vendor_ruby/highline.rb:983:in +': no implicit conversion of nil into Array (TypeError) from /usr/lib/ruby/vendor_ruby/highline.rb:983:inpage_print'
from /usr/lib/ruby/vendor_ruby/highline.rb:722:in format_statement' from /usr/lib/ruby/vendor_ruby/highline.rb:617:insay'
from /usr/lib/ruby/vendor_ruby/highline.rb:257:in ask' from /usr/lib/ruby/vendor_ruby/highline.rb:361:inchoose'
from /usr/lib/ruby/vendor_ruby/kafo/wizard.rb:78:in configure_module' from /usr/lib/ruby/vendor_ruby/kafo/wizard.rb:51:inblock (3 levels) in main_menu'
from /usr/lib/ruby/vendor_ruby/highline/menu.rb:312:in call' from /usr/lib/ruby/vendor_ruby/highline/menu.rb:312:inselect'
from /usr/lib/ruby/vendor_ruby/highline.rb:362:in choose' from /usr/lib/ruby/vendor_ruby/kafo/wizard.rb:45:inmain_menu'
from /usr/lib/ruby/vendor_ruby/kafo/wizard.rb:33:in run' from /usr/lib/ruby/vendor_ruby/kafo/kafo_configure.rb:134:inexecute'
from /usr/lib/ruby/vendor_ruby/clamp/command.rb:68:in run' from /usr/lib/ruby/vendor_ruby/clamp/command.rb:133:inrun'
from /usr/lib/ruby/vendor_ruby/kafo/kafo_configure.rb:154:in run&#39; from /usr/sbin/foreman-installer:8:in<main>'