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I am seeing the following error in the console on every page of our site (Magento 2.1.4)...

Failed to load resource: the server responded with a status of 400 () - customer/section/load/?sections=review&update_section_id=false&_=1507203330016
Uncaught Error: [object Object]
at Object.<anonymous> (customer-data.js:86)
at fire (jquery.js:3099)
at Object.fireWith [as rejectWith] (jquery.js:3211)
at done (jquery.js:9312)
at XMLHttpRequest.callback (jquery.js:9720)

It only seems to appear when I merge the JS in admin. If JS is not merged then the error does not appear.

Does anyone know what this is related to (other than the merge of JS)?

I checked this answer: TypeError: options is undefined (customer-data.js) but I have not extended Magento_Customer module so I dont think it is related.

Thanks for any help

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Slightly more in-depth explanation...

Magento\Customer\Controller\Section\Load returns a 400 status code when the requested section is not found within Magento\Customer\CustomerData\SectionPoolInterface::sectionSourceMap

Source maps are added by their respective modules' using dependency injection in module/etc/frontend/di.xml. The review section is added here: https://github.com/magento/magento2/blob/9db4501d29028ba9ac552f14d80b42bc923847f4/app/code/Magento/Review/etc/frontend/di.xml#L32

I've found this information helpful when troubleshooting other customer section request errors.

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Although TypeError: options is undefined (customer-data.js) was not the answer it did help me to debug - turns out my reviews module was disabled - re-enabling solved it

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