WooCommerce add to cart not working on some mobile devices

I noticed that the woocommerce add to cart button was not working on some mobile devices and browsers on a client website. So let’s start debugging…

I tested this on iPhone 5c with Safari and the product did not get added to the cart. Using the Safari developer tools I managed to detect an error in some JavaScript that was not showing up in any other browsers on the desktop running mobile user agents.

Error: Syntax error, unrecognized expression: form.cart input[name="variation_id]

The error seems to be generating from this file:

/wp-content/plugins/synmedia-woocommerce-rewards/assets/js/jquery.swr.product.js

There is an error in this file from the plug-in: Syn Media  WooCommerce Rewards, version 2.3.6

On line 9 both quotes are missing arround the variable: variation_id

function swr_variations_options_changed(){
    if($('form input[name=variation_id]').val() != ''){
        swr_options_changed();
} }

On line 18 and 19
variation_id variable is missing the closing quote (“) on both lines.

function swr_options_changed(){       
var product_id = 0;       
var variation_id = 0;       
var qtys = '';        
if( $( 'form.cart input[name="variation_id]' ).length > 0 ){           v
ariation_id = $('form.cart input[name="variation_id]').val();
.....

Changing the above code with the correct quotes fixed the issue on the website. Now also mobile devices can add products to the shopping cart.

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