How to troubleshoot a common JavaScript error on Magento ecommerce websites
If ecommerce sites using the Magento 2 platform are upgraded to certain versions, users may experience this error when loading site pages. If this issue does appear, it occurs frequently and may prevent key JavaScript elements, like the Add to Cart and Login buttons, from functioning correctly. Learn everything you need to know about this error and how to troubleshoot it in this blog post.
JavaScript error description
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JavaScript error background
This JavaScript Magento error originates from the storage.remove(sectionName) function call made within the remove function. Since storage is undefined, the entire function fails.
This issue initially occurred when Magento upgraded from version 2.3.6 to version 2.4. During this update, Magento changed how it initializes storage. More specifically, storage initialization is now a wrapped function and is no longer available at a global level.
A patch was developed and released to resolve the issue. The fix was merged into Magento version 2.4.3.
Unfortunately, during the update to version 2.4.5, this fix was removed for unknown reasons, and the error returned.
Potential solution for this JavaScript error for Magento sites
Consult the resources below for context surrounding the issue's cause and solution:
Please proceed only if you feel comfortable making manual changes to your Magento instance. Magento will likely re-release the issue's fix in a future version.
As of Magento version 2.4.5 (October 2022), the fix is to manually apply a patch that reverses the previous fix's removal. The patch content can be found here.
Simply add this to a patch file and follow these steps to add this to your Magento instance.
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Regardless of the ecommerce platform your site is built on, you cannot completely escape JavaScript errors. What you can do is catch them before they do significant damage to your conversions and customer experience.
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