"[Amplitude] TypeError: undefined is not an object (evaluating 't._metadataStorage.save')" errors seen on Sentry

[bitttttten]

We are seeing "[Amplitude] TypeError: undefined is not an object (evaluating 't._metadataStorage.save')" errors from Sentry. We also found the _metadataStorage.save code here:

Amplitude-JavaScript/src/amplitude-client.js

Line 735 in 03c0a89

scope._metadataStorage.save(cookieData);

We are wondering if this is something like a bug in the amplitude client, or are we setting up Amplitude incorrectly?

Environment

{
"node_modules/amplitude-js": {
      "version": "8.21.9",
      "resolved": "https://registry.npmjs.org/amplitude-js/-/amplitude-js-8.21.9.tgz",
      "integrity": "sha512-d0jJH00wbXu7sxKtVwkdSXtVffjqdUrxuACKlnzP7jU5qt9wriXXMgHifdH5Oq+buKmyF8wKL9S02gAykysURA==",
      "dependencies": {
        "@amplitude/analytics-connector": "^1.4.6",
        "@amplitude/ua-parser-js": "0.7.33",
        "@amplitude/utils": "^1.10.2",
        "@babel/runtime": "^7.21.0",
        "blueimp-md5": "^2.19.0",
        "query-string": "8.1.0"
      }
    },
}

How we initialise:

export const Amplitude = () => {
  const userId = useUserId()
  const amplitudeCookieSessionId = useCookie(AMPLITUDE_SESSION_ID_COOKIE_NAME)

  React.useEffect(() => {
    if (deviceId) {
      amplitude.getInstance().setDeviceId(deviceId)
    }
  
    amplitude.getInstance().init(AMPLITUDE_API_KEY, undefined, {
      includeUtm: true,
      includeReferrer: true,
      includeGclid: true,
      saveParamsReferrerOncePerSession: true,
      unsetParamsReferrerOnNewSession: true,
    })
  }, [amplitudeCookieDeviceId])

  React.useEffect(() => {
    amplitude.getInstance().setUserId(userId)
  }, [userId])

  return null
}

We've been trying to dig around but we have had no leads. Let me know if anything sticks out, happy to help try and debug too.

[Mercy811]

Hi @bitttttten, thanks for choosing Amplitude. To further debug this error, we need more info.

• How often do you see this error?
• Could you provide the website so that we can test on?
• What device and environment did this error was on?