Catalog Products List widget is not displayed on Storefront

[alena-marchenko]

Preconditions

1. Magento is installed from 2.2-develop branch

Steps to reproduce

1. Go to Stores > Attributes > Product and open "Color" attribute
2. Create 2 options red and black
3. Add this attribute to attribute set
4. Create 2 simple products with red and black attributes
5. Go to Stores> Configuration > CATALOG > Catalog > Storefront
6. Set "Use Flat Catalog Category" = Yes and "Use Flat Catalog Product" = "Yes"
7. Go to Content > Widgets and create new widget with:
   Storefront Properties

• Widget Title = Test widget
• Assign to Store Views = All Store Views
• Layout Updates:
  -- Display on = All Pages
  -- Container = Main Content Area

Widget Options

• Title = test
• Number of Products to Display = 10
• Conditions: Color is red

8. run
   rm -rf var/* pub/static/* generated/*
   php bin/magento indexer:reindex
   php bin/magento setup:static-content:deploy
9. Go to Storefront

Expected result

Widget is visible on Storefront

Actual result

Widget is not visible on Storefront, following error persists in support_report.log:
report.CRITICAL: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'at_color.value' in 'where clause', query was: SELECT COUNT(DISTINCT e.entity_id) FROM catalog_product_flat_1 AS e
INNER JOIN catalog_category_product_index AS cat_index ON cat_index.product_id=e.entity_id AND cat_index.store_id='1' AND cat_index.visibility IN(2, 4) AND cat_index.category_id='2'
INNER JOIN catalog_product_index_price AS price_index ON price_index.entity_id = e.entity_id AND price_index.website_id = '1' AND price_index.customer_group_id = 0 WHERE (((IFNULL(at_color.value, 0) = '13') ))

[RostislavS]

#mageconf

[magento-engcom-team]

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