Here is the stack trace. It clearly shows the error is in Cockpit.
*NoMethodError*
*undefined method `sub!' for nil:NilClass*
/opt/theforeman/tfm/root/usr/share/gems/gems/foreman_cockpit-2.0.2/app/controllers/concerns/foreman_cockpit/hosts_controller_extensions.rb:26:in
`allow_cockpit_iframe'
Any updates or details on how you removed the cockpit plugin? I have
disabled it in my Foreman 1.14 but it is still giving the error.
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