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Uncaught TypeError: Argument 4 passed to Magento\Sales\Block\Adminhtml\Items\Column\Name::truncateString() must be of the type string, null given, called in /vendor/magento/module-downloadable/view/adminhtml/templates/sales/items/column/downloadable/name.phtml on line 25 and defined in /vendor/magento/module-sales/Block/Adminhtml/Items/Column/Name.php:36 in magento 2.2.7

I have disabled all third party extension.

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Uncaught TypeError: Argument 4 passed

Please follow below steps

Step 1 remove the var folder from magento root.

Step 2 remove the generated folder from magento root.

Step 3 clear cache and check it again.

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