NoMethodError: undefined method `downcase' for nil:NilClass
https://sentry.gitlab.net/gitlab/gitlabcom/issues/1637548/?referrer=gitlab_plugin
NoMethodError: undefined method `downcase' for nil:NilClass
email.rb:28:in `email='
write_attribute(:email, value.downcase.strip)
devise/models/authenticatable.rb:223:in `apply_to_attribute_or_variable'
send("#{attr}=", new_value)
devise/models/authenticatable.rb:206:in `block in downcase_keys'
self.class.case_insensitive_keys.each { |k| apply_to_attribute_or_variable(k, :downcase) }
devise/models/authenticatable.rb:206:in `each'
self.class.case_insensitive_keys.each { |k| apply_to_attribute_or_variable(k, :downcase) }
devise/models/authenticatable.rb:206:in `downcase_keys'
self.class.case_insensitive_keys.each { |k| apply_to_attribute_or_variable(k, :downcase) }
...
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NoMethodError: undefined method `downcase' for nil:NilClass