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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"

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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';

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  • that didn't work for me :/
    – Greg
    Jan 29, 2019 at 10:40

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