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

[kanduvisla]

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.

[veloraven]

@kanduvisla thank you for your report.
Please, format this issue according to the Issue reporting guidelines: with steps to reproduce, actual result and expected result.

[kanduvisla]

It get's weirder:

When I delete all my cookies, I don't get the error. However, as soon as I add a product to the cart and refresh the page afterwards, the error pops up. But even more strange: when I open an incognito window in Chrome, the error doesn't occur!

[kanduvisla]

Further investigation shows that my 'regular' browser (which is Chrome by the way) makes an additional XHR request to http://www.domain.com/customer/section/load/?sections=paypal-billing-agreement&update_section_id=false&_=1472630495115 whereas the incognito window doesn't. What gives?

[kanduvisla]

GOT IT!

It turns out that customer-data.js uses the localStorage to store a variety of stuff (probably for caching purposes). This means that when a module (or Magento) updates, you'd better make sure to flush your local storage as well, because otherwise you're in a world of debugging-hurt

[codelogn]

Thanks, flushing cache storage worked for me too.

[Tristan-N]

Hm, god for you it worked, but it doesn't for me. I also get this error in incognito mode. Happens in both incognito and regular browser. Cleared all browsercaching, Magento caching, removed all folders in pub/static, var/di, var/generation, var/view_preprocessed and regenerated it all again but the error remains. Did you notice this in production or in developer mode?

[Khaleel]

Have there been fixes for this? The localStorage is mashed up hack!

[jghaanstra]

I experience the same issue with Magento 2.1.5 in Developer Mode. Clearing caches does not seem to work, it also happens in incognito mode from Chrome.

[christian-forgacs]

+1

[winds1983]

Same issue on 2.1.6, how to fix?

[Khaleel]

This sometimes resolve itself.

[mvmenno]

I got this issue as well on 2.0.11 using PHP 7.0 and chrome.
Further console logging customer-data.js:49 gives the following error for me:
Warning: array_key_exists() expects parameter 2 to be array, null given in /var/www/alpha/vendor/magento/module-customer/CustomerData/Section/Identifier.php on line 82

Possible fix:
extend this file (Identifier.php) and add this in the foreach loop in the function markSections:
if(!isset($sectionsData[$name])){
$sectionsData[$name] = [];
}