We are currently evaluating different tracking tools, and see problems with the Piwik Pro-pushed data layer in combination with KnockoutJS in a Magento 2 shop.
We are getting the following error in the Sentry bug monitoring tool.
As per our analysis, somewhere in the Piwik Pro code, the DOM element seems to be pushed to the data layer, which is later tried to serialize.
Due to the use of KnockoutJS in the Magento checkout there is are ko… Objects attached to each element which are very complex and contain circular references. The full payload seems to be ~ 1.3MB.
is there are way to avoid such objects to be pushed to the datalayer by Piwik pro?
The problem does not seem to be appear in GTM.
Uncaught (in promise) TypeError: Converting circular structure to JSON
--> starting at object with constructor 'UiClass'
| property 'containers' -> object with constructor 'Array'
| index 0 -> object with constructor 'UiClass'
| property '_elems' -> object with constructor 'Array'
--- index 0 closes the circle
at JSON.stringify (<anonymous>)
at s.js?z=x:3:180
at new Promise (<anonymous>)
at zaraz.track (s.js?z=redacted:1:1228)
at zaraz._processDataLayer (s.js?redacted:5:1755)
at Array.value (s.js?z=redacted:5:1972)
at n.dataLayer.push (2223ca20-76de-4a2c-ab55-f18ccc97222d.js:7:157469)
at Fy.b.push (gtm.js?id=GTM-xxxx:484:165)
at Fy.b.push (js?id=G-xxxxx&l=dataLayer&cx=c:508:165)
at HTMLDocument.listener (2223ca20-76de-4a2c-ab55-f18ccc97222d.js:7:60404)
at HTMLDocument.sentryWrapped (helpers.ts:98:1)
