Issue description

I get the following error in the console. It doesn’t matter if I’m logged in or not or if I have any products in my cart:

customer-data.js:49 Uncaught Error: [object Object]

Steps to reproduce

1. Open Chrome (version 52 at the moment of writing).
2. Go to a product detail page.
3. Add to the cart.
4. Refresh the page.

Watch the console.

Expected result

No error in the console

Actual result

Error in the console:

customer-data.js:49 Uncaught Error: [object Object](anonymous function) 
@ customer-data.js:49 fire 
@ jquery.js:3099 fireWith 
@ jquery.js:3211 done 
@ jquery.js:9312 callback 
@ jquery.js:9720

Additional information

Prior before the error a XHR request throws a 400 error (http://www.domain.com/customer/section/load/?sections=paypal-billing-agreement&update_section_id=false&_=1472630495115). This results a valid JSON object:

{"message":"\"paypal-billing-agreement\" section source is not supported"}

I think the 400 error status results the exception to be thrown in customer-data.js. I’m not sure if this is an issue with Magento, my PSP (MultisafePay) or the OnePageCheckout module I’m using.

Did anyone else encounter this problem is well?

Edit: When I disable the PSP and Checkout plugin, the error still persists, which makes sense because it never showed up before.

Edit 2: When I also disable Magentos’ Braintree and Paypal plugin, the error still persists. Which is odd. Also, I noticed that in an incognito window I don’t get the error.

Edit 3: It doesn’t happen in incognito mode. For some reason, the ‘regular’ mode makes an extra XHR request that triggers the error.