Cannot Checkout: SyntaxError: Unexpected token E in JSON at position 0

Hi,

we’re having the exact same problem since running the woocommerce update last night.

The orders also go through and the credit cards are charged, but the download does not appear in the customers account.

I get the following client side errors:

Unable to fix malformed JSON
checkout.min.js:1 Uncaught TypeError: Cannot read property ‘reload’ of null
at Object.success (checkout.min.js:1)
at i (jquery.js:2)
at Object.fireWith [as resolveWith] (jquery.js:2)
at y (jquery.js:4)
at XMLHttpRequest.c (jquery.js:4)

and when i look at the json response (/checkout/?wc-ajax=checkout) it is blank, even though i do get some response headers.

I’d be very grateful for any assistance..

thanks,

Max

Hello,

Here are the full error messages:

Error code: 4401 Error message: Unable to populate data, please check if mandatory value is entered correctly.

I tried updating to WooCommerce 3.1 and the only difference is that the error in the console is now:
Unable to fix malformed JSON checkout.min.js?ver=3.1.0:1

Note that registered users can checkout with no problems. The problem only affects guest checkout.

I’m seeing the same problem as @madmaxau. I’m using WooCommerce 3.1.2 on an up-to-date WordPress 4.8.1 site. The AJAX request to “/checkout/?wc-ajax=checkout” is made and has a “Status Code” of “200 OK”. The Response Headers are there and look OK, but the “Content-Length” is 0 and the Response is empty.

Changing the theme from Avada to “Twenty Seventeen” didn’t help. I am working through disabling plugins to see if I can find a “smoking gun” but nothing yet.