Firefox-ios: undefined is not an object (evaluating 'webkit.messageHandlers.contextMenuMessageHandler.postMessage')

[chocnut]

We keep getting this event in our sentry. Does anyone know what is this error about? Thank you!

[Tobbe]

Same here!
It's a Create-React-App typescript application, and we don't have postMessage anywhere in our own code

Here are our dependencies (minus two private packages I didn't want to post here) and devdeps:

  "dependencies": {
    "@types/google.analytics": "0.0.40",
    "@types/jest": "24.0.18",
    "@types/jump.js": "^1.0.2",
    "@types/lodash": "^4.14.144",
    "@types/node": "12.7.12",
    "@types/react": "16.9.5",
    "@types/react-dom": "16.9.1",
    "@types/react-redux": "^7.1.4",
    "@types/react-router-dom": "^5.1.0",
    "@types/redux": "^3.6.0",
    "@types/ua-parser-js": "^0.7.33",
    "body-scroll-lock": "^2.3.8",
    "classnames": "^2.2.5",
    "d3-interpolate-path": "^2.0.1",
    "jump.js": "^1.0.2",
    "node-sass": "^4.13.0",
    "qrcode.react": "^0.9.2",
    "query-string": "^6.4.2",
    "react": "^16.10.2",
    "react-animate-height": "^2.0.7",
    "react-app-polyfill": "^0.2.2",
    "react-dom": "^16.10.2",
    "react-flatpickr": "^3.7.1",
    "react-json-tree": "^0.11.2",
    "react-json-view": "^1.19.1",
    "react-number-format": "^4.2.0",
    "react-redux": "^7.1.0",
    "react-router-dom": "^5.1.2",
    "react-router-redux": "^4.0.7",
    "react-scripts": "3.2.0",
    "redux": "^4.0.1",
    "typescript": "3.6.4",
    "ua-parser-js": "^0.7.20"
  },
  "devDependencies": {
    "csvtojson": "^1.1.9",
    "moment": "^2.19.1",
    "node-sass-chokidar": "^1.3.4",
    "raven-js": "^3.27.0"
  },

[Simon0x]

We have the same problem. We are using Rollbar instead of Sentry.

[punarinta]

Same here. Does anyone know if this can be safely ignored? It doesn't seem to have any visual or functional effect.

[chocnut]

@punarinta, for now, I've added this to ignoreErrors list of Sentry config

[anderssv]

Also occurring at our site, only on "Firefox iOS 14.0". Using React create app as well.

[frankPairs]

Same issue here. Is there any clue about the root of the problem? thanks!

[Tobbe]

Could it be fixed by this? https://github.com/brave/brave-ios/issues/2026

[dnarcese]

I'm not seeing this error on Firefox

[StudioMaX]

Not sure if this will help someone. This error catched at this line in Sentry:
https://github.com/getsentry/sentry-javascript/blob/5.12.1/packages/browser/src/helpers.ts#L96

Raw exception:

TypeError: undefined is not an object (evaluating 'webkit.messageHandlers.contextMenuMessageHandler.postMessage')
  at ignoreOnError(./node_modules/@sentry/browser/esm/helpers.js:81:25)

User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 13_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/21.0 Mobile/15E148 Safari/605.1.15

Sentry's additional arguments:

[
  {
    currentTarget: [object Window], 
    isTrusted: [object TouchEvent], 
    target: *some_div_here*
    type: touchstart
  }
]

browser: Firefox iOS 21.0
browser.name: Firefox iOS
device: iPhone
device.family: iPhone
environment: production
handled: yes
level: error
mechanism: instrument
os: iOS 13.3.1
os.name: iOS

[nbhasin2]

Hi, does anyone have steps to reproduce this? Will be closing this otherwise as I don't see errors on my end. cc @chocnut @Tobbe

[Tobbe]

No, can't reproduce. It has always been coming from our visitors. We have /ignore on that error now. Last time we logged it was Feb 13, by then we had gotten it 110 times. I don't have an iPhone myself to try to reproduce it with.

[nbhasin2]

Going to close this as we don't have steps to reproduce. Suggestion would be to open a new one if you find steps with more information.