Error in CMS editor

One of my websites is running on Odoo. This CMS has a frontend (inline) editor to manage website content.
When Piwik Pro is added to this website, I get a lot of errors:

Any idea what could be causing this? It’s quite annoying because every time an error appears, my editor is broken and I have to reload the page (or even disable Piwik Pro while editing).

Could you please share where I can find this error?