TypeError: Cannot read property 'codePointAt' of undefined

https://sentry.gitlap.com/gitlab/gitlabcom-clientside/issues/31095/

TypeError: Cannot read property 'codePointAt' of undefined
  at isHorceRacingSkinToneComboEmoji (./behaviors/gl_emoji/is_emoji_unicode_supported.js:31:37)
  at checkHorseRacingSkinToneComboEmojiSupport (./behaviors/gl_emoji/is_emoji_unicode_supported.js:78:38)
  at generatedUnicodeSupportMap (./behaviors/gl_emoji/is_emoji_unicode_supported.js:108:4)
  at generatedUnicodeSupportMap (./behaviors/gl_emoji.js:92:31)
...
(4 additional frame(s) were not displayed)