SDK bug on iOS Firefox

[DaddyWarbucks]

• Review the documentation: https://docs.sentry.io/
• Search for existing issues: https://github.com/getsentry/sentry-javascript/issues
• Use the latest release: https://github.com/getsentry/sentry-javascript/releases
• Provide a link to the affected event from your Sentry account

https://sentry.io/share/issue/52e170dbb4b84d16a8e92ece8d4978e9/

Package + Version

• @sentry/browser
• @sentry/node
• raven-js
• raven-node (raven for node)
• other:

Version:

5.5.0

Description

Please see the attached link. I do not have a reproducible repo. But, I am receiving an error

TypeError
null is not an object (evaluating 'a.title')

that originates from the SDK itself rather than from my own code. I do have a few places in my code where state.title is used, but none on the affected page shown in the error.

[DaddyWarbucks]

I see that the shareable link shows a limited amount of info. Please see dump below for more info.

User Agent

Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_3 like Mac OS X) AppleWebKit/603.3.8 (KHTML, like Gecko) FxiOS/14.0b12646 Mobile/14G60 Safari/603.3.8
--

browser
Firefox iOS 14.0
browser.name
Firefox iOS
device
iPhone
device.family
iPhone
environment
production
handled
yes
level
error
mechanism
instrument
os
iOS 10.3.3
os.name
iOS

[kamilogorek]

@DaddyWarbucks you can post a direct link to the event

[DaddyWarbucks]

I assumed you would not be able to see it for auth reasons, but here it is https://sentry.io/organizations/straightline-ct/issues/1135547765/?project=1500106

[kamilogorek]

I forgot to move an execution note after adding handleEvent block. Fixed: 3bada5d

This error is only shown as Sentrys because of how we wrap internal timing APIs, see:

You should be able to dig into the main cause by looking for setTimeout instances in your code that has title access in them.

[chocnut]

@kamilogorek we face the same issue with @DaddyWarbucks so does this mean it's fixed and we just need to upgrade to 5.6.3?

[chocnut]

@kamilogorek I don't have setTimeout for access *.title to any of my code. Can you please shed more light about this?

[kamilogorek]

@chocnut same question as with previous issue, can you post a link to the event so I can see what's going on in there?

[lphilips]

@kamilogorek we can confirm @chocnut 's problem: we get this issue on Firefox iOS with version 5.7.0 as well.
We do not have a setTimeout with access to a title property in our code.

However, the Sentry event indicates that it's handled and that the function is setTimeout ..
(See https://sentry.io/organizations/2rivers-nv/issues/1263831869/events/7f024c4b94ab44ab9b870d6558d27149/ )

[gargrave]

Just wanted to confirm that we are seeing this error as well from iOS Firefox users: TypeError: null is not an object (evaluating 'a.title')

The only .title used anywhere in our codebase is from Sass Modules, and those are already compiled out by the time the code gets to production.

Our Sentry project is private, so unfortunately I cannot provide any links, but all of the issues have been from iOS 13, with Firefox 19 & 20. It's easy to reproduce, though--just load the site with the Sentry script on it, and it triggers the error.

I am happy to provide any additional information, so feel free to ping me if I can help in any way. 👍

[lepture]

This is a screenshot of the same issue. Only happens in iOS Firefox.

[icyJoseph]

We've started to face this issue as well. Any updates or work-around? Exactly the same logs as shown above, exclusively for FF iOS users.

[chrishoage]

We are also seeing this issue, also exclusively with Firefox on iOS (and Apple Mail, oddly enough). I'm provided the stack trace which is backed by a source map. It does seem a little different than the one I see above.

Considering there are so many independent reports of this, all around iOS, it seems like the issue may be in the sentry SDK?