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I am updating an e-commerce with Magento, from version 2.1.18 to version 2.3.4 (I have verified that it also happens by updating to version 2.2.11).

Everything went well, but when I add a product to the cart I get the javascript error

Uncaught TypeError: Cannot read property 'after' of null
    at Object.insert (arrays.js:122)
    at collection.js:94
    at Array.map (<anonymous>)
    at UiClass.insertChild (collection.js:91)
    at layout.js:433
    at Registry._resolveRequest (registry.js:418)
    at Array.forEach (<anonymous>)
    at Registry._updateRequests (registry.js:400)
    at later (underscore.js:821)

cart screenshot with js arrays.js error

Same mistake if I go to checkout.

I am verifying that the subtotals of the order are not loaded, I do not know if it is the consequence of the error or the cause of the error.

  • I have disabled and deleted all the installed modules;
  • I have disabled all unnecessary modules of Magento 2.3.4;
  • I have deleted my theme and I am using the Luma theme;
  • I deleted cache, indexes and static files and created everything again,

but the problem is always there.

  • Please go to the network tab and check the response ... – Mohit Patel Mar 12 at 6:14
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Please try to run the command:

php bin/magento setup:static-content:deploy

please comment if it works!

| improve this answer | |
  • on Magento 2.3 you need to force the creation of static content on command line php bin/magento setup:static-content:deploy -f I had already said that it is one of the tests that I did, but that did not result in the problem – wertherhiggs Mar 12 at 8:53

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