Undefined variable: /vendor/magento/module-catalog/Controller/Adminhtml/Product/Save.php while save configurable product in magento2

Question

When I save configurable product with big length sku then error showing

"0":"Notice: Undefined variable: product in /MASKED_DIR/2018-08-06_12-56-07/htdocs/vendor/magento/module-catalog/Controller/Adminhtml/Product/Save.php on line 156"

Answer 1

I Fixed in my website!
Please check below process

1. set "const SKU_MAX_LENGTH = 255;" in the file module-catalog/Model/Product/Attribute/Backend/Sku.php

2. You need to change the into database as well. Go to table eav_attribute, search for sku at column attribute code then edit the resulted row.

   Update the field frontend_class to null or validate-length maximum-length-255 according to your requirement.

3. You have to change field size at the database table.

   ALTER TABLE catalog_product_entity CHANGE sku sku VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT 'SKU';