All of our publicly embedded charts are down with javascript error

We haven't made any change to our integration but suddenly 2 hours ago all of our charts show the following error:
"Don't know how to create ISeq from: java.lang.Integer"

Could someone help us de-bug? We use Metabase for a user-facing data visualization feature so this impacts thousands of users. We have no idea why this suddenly popped up.

This is a screenshot from our staging app - the issue is the same in production with our users. All of our dashboard work in the metabase app. Nothing has been released today that affected the Metabase integration.

Engineers suggest that I join this screenshot:

@clementfernon you have an active subscription with us, please write to support, we'll be looking at the issue and provide you with an update

For reference: