I am running Magento 2.1.1 in apache2.4.
I always see some random errors in the shopping cart.
The cart cannot calculate the grand total(nothing show) and cannot go to checkout page after clicking the checkout button. This error happens randomly (around 40%) in responsive mobile version.

enter image description here Error 1

This is another error triggered.

enter image description here enter image description here

  • Why you run this old version? Update asap to last version.
    – LucScu
    Jul 20 '17 at 6:51
  • Do you mean 2.1.7? I tried before. But no idea why it slowed down my system.
    – user631607
    Jul 20 '17 at 8:23
  • I updated to 2.1.7. Same errors happen in mobile view. Seems that the JS crashed in mobile view only.
    – user631607
    Jul 20 '17 at 8:46
  • have you original luma or custom theme?
    – LucScu
    Jul 20 '17 at 17:59
  • I am using custom theme
    – user631607
    Jul 21 '17 at 3:06

I found the reason why js crashed in mobile only. Because I added a live chat javascript at the footer and this javascript does not support mobile.

I added a screen width checking to remove the plugin in mobile view and fixed it.

if (screen && screen.width > 480) {
  document.write('<script type="text/javascript" src="foo.js"><\/script>');

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