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Getting this error on manage products page of Magento 2 version 2.2.6 after uploading an image:

Notice: Undefined index: media_type in vendor/magento/module-product-video/Model/Plugin/Catalog/Product/Gallery/ReadHandler.php on line 60

That is in developer mode. In Production mode the site give a general 503 error.

Another error in php 7.0 on content > design configuration > edit is a spinning wheel and in chrome console this:

dynamic-rows.js:1035 Uncaught TypeError: this.getChildItems(...).forEach is not a function

file-uploader.js:74 Uncaught TypeError: value.map is not a function

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Couldn't find the root cause of this but if you change the php from 7.0 to 7.1 both errors go away

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