ActionController::BadRequest: Invalid query parameters: Non UTF-8 value

https://sentry.gitlab.net/gitlab/gitlabcom/issues/580807/

Rack::QueryParser::InvalidParameterError: Non UTF-8 value: 
  action_dispatch/request/utils.rb:26:in `check_param_encoding'
    raise Rack::Utils::InvalidParameterError, "Non UTF-8 value: #{params}"
  action_dispatch/request/utils.rb:21:in `block in check_param_encoding'
    params.each_value { |value| check_param_encoding(value) }
  action_dispatch/request/utils.rb:21:in `each_value'
    params.each_value { |value| check_param_encoding(value) }
  action_dispatch/request/utils.rb:21:in `check_param_encoding'
    params.each_value { |value| check_param_encoding(value) }
  action_dispatch/http/request.rb:343:in `block in GET'
    Request::Utils.check_param_encoding(rack_query_params)
...
(90 additional frame(s) were not displayed)

ActionController::BadRequest: Invalid query parameters: Non UTF-8 value: acux5621z1z2abcxuca5621

ActionController::BadRequest: Invalid query parameters: Non UTF-8 value: acux5621z1z2abcxuca5621