TypeError: Cannot call method 'replace' of undefined

[muxin]

Error rate is high, happening in latest canary: 1498863866481

TypeError: Cannot call method 'replace' of undefined
    at https://cdn.ampproject.org/rtv/001498863866481/v0.js:89:51
    at https://cdn.ampproject.org/rtv/001498863866481/v0.js:25:87

export function extractClientIdFromGaCookie(gaCookie) {
  return gaCookie.replace(/^(GA1|1)\.[\d-]+\./, '');
}

[muxin]

/cc @lannka

[muxin]

/cc @aghassemi, might be related to #9952

[aghassemi]

@lannka We are either hitting the 10000 timeout which would result in an undefined for cid.get (we should return '' in the catch I believe) or somehow getExternalCid_ is returning undefined. I don't think it is related to optout, if user is opted out, we always return empty string.

[aghassemi]

for now reverting 1% back to the version without cid but keeping optin canary until we can look into this issue (cid stuff should not have caused new errors)