How can I stop _isMatchingDomain reference errors coming from Facebook referrer URLs?

user_7101961 0
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This morning I got loads of javascript errors:

ReferenceError: _isMatchingDomain is not defined at parseCookie 
                at HTMLDocument.set [as cookie]

Variable _isMatchingDomain is not on our website and is coming only from certain browsers:

Mozilla/5.0 (X11; Linux x86_64)

AppleWebKit/537.36 (KHTML, like Gecko)

Chrome/61.0.3163.100

Safari/537.36

Additional information from comments below:

The IPs triggering the error seem to be owned by Facebook. Possibly a Facebook crawler? (Chris Morbitzer)

The referrer URLs are all from Facebook (Rob Wierzbowski)

Does anyone know the source of this error, if it affects users, and how to fix?

facebook javascript
2 Answers

We're getting the same thing too. All of the request IPs come from Facebook-owned addresses so we think they are the crawlers executing some script. It's irritating to say the least.

Edit: I'm wondering if this has something to do with also using Piwik/Matomo? Here's our full stacktrace in one example:

:1:32551:43parseCookie
:1:32551HTMLDocument.set [as cookie]
https:///piwik.js:42:141c0
https:///piwik.js:48:240bo
https:///piwik.js:65:146Q.setCookieDomain
https:///piwik.js:23:60ac
https:///piwik.js:70:900c
https:///piwik.js:71:348aa
https:///piwik.js:72:279Object.addTracker
https:///piwik.js:75:386
user_44907610

I think it is not related specifically to Piwik/Matomo, more like to general cookie setting/accessing. We are also using Piwik, but ReferenceError · _isMatchingDomain is not defined gets thrown here:

:1:32396:43parseCookie  
:1:32396HTMLDocument.set [as cookie]    
https://trk.opentrack.org/v2:1:1253Function.b.dc    
https://trk.opentrack.org/v2:1:1979Function.b.pu    
https://trk.opentrack.org/v2e:1:121 
https://trk.opentrack.org/v2e:1:326
user_103600940
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