ActionView::Template::Error: must specify an iv

https://sentry.gitlab.net/gitlab/gitlabcom/issues/1188164/

ArgumentError: must specify an iv
  encryptor.rb:61:in `crypt'
    raise ArgumentError.new('must specify an iv') if options[:iv].to_s.empty?
  encryptor.rb:49:in `decrypt'
    crypt :decrypt, *args, &block
  attr_encrypted.rb:240:in `decrypt'
    value = options[:encryptor].send(options[:decrypt_method], options.merge!(value: encrypted_value))
  attr_encrypted.rb:329:in `decrypt'
    self.class.decrypt(attribute, encrypted_value, evaluated_attr_encrypted_options_for(attribute))
  attr_encrypted.rb:161:in `block (2 levels) in attr_encrypted'
    instance_variable_get("@#{attribute}") || instance_variable_set("@#{attribute}", decrypt(attribute, send(encrypted_attribute_name)))
...
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ActionView::Template::Error: must specify an iv

ActionView::Template::Error: must specify an iv

Affecting Silver Customer with 3 seats (internal): https://gitlab.zendesk.com/agent/tickets/144669