Name: Magento Development
Brand: Mage Monkeys
Rating: 4.8 (552 reviews)

In the beforeSave method in file

\Magento\Catalog\Model\Category\Attribute\Backend\Image

REPLACE

$imageName = $this->checkUniqueImageName($imageName);

1	$imageName = $this->checkUniqueImageName($imageName);

WITH

if (array_key_exists('tmp_name', $value[0])) {
$imageName = $this->checkUniqueImageName($imageName);
}

if (array_key_exists('tmp_name', $value[0])) {

$imageName = $this->checkUniqueImageName($imageName);

}

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