After deleted custom attribute and getting
Fatal error: Uncaught Error: Call to undefined method Magento\Customer\Model\Indexer\Source::addAttributeToSelect() in /vendor/magento/framework/Indexer/Handler/AttributeHandler.php on line 38
Is this bug in Magento 2.2.3? (https://github.com/magento/magento2/issues/10838)
This issue is incredible because It is the result of a fake configuration of the file:
module-customer/etc/indexer.xml
In fact the bug is the line 14:
<fieldset name="customer" source="Magento\Customer\Model\Indexer\Source"
must be changed in
<fieldset name="customer" source="Magento\Customer\Model\ResourceModel\Customer\Collection"
So the problem is solved.
