Error 500 loading user session: invalid byte sequence in UTF-8

https://sentry.gitlap.com/gitlab/gitlabcom/issues/182993/

ArgumentError: invalid byte sequence in UTF-8
  redis/store/namespace.rb:97:in `match'
    key.match(namespace_regexp) ? key : "#{namespace_str}:#{key}"
  redis/store/namespace.rb:97:in `match'
    key.match(namespace_regexp) ? key : "#{namespace_str}:#{key}"
  redis/store/namespace.rb:97:in `interpolate'
    key.match(namespace_regexp) ? key : "#{namespace_str}:#{key}"
  redis/store/namespace.rb:88:in `namespace'
    yield interpolate(key)
  redis/store/namespace.rb:23:in `get'
    namespace(key) { |k| super(k, options) }
...
(84 additional frame(s) were not displayed)

ArgumentError: invalid byte sequence in UTF-8