Title: Undefined Index / Uncaught Error
Last modified: August 16, 2021

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# Undefined Index / Uncaught Error

 *  [Lusmo](https://wordpress.org/support/users/vincentchow/)
 * (@vincentchow)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/undefined-index-uncaught-error/)
 * I have noticed the following errors in my debug log. However, the plugin seem
   to be working fine from my testing and I couldn’t replicate the issue. Any ideas?
 *     ```
       [16-Aug-2021 08:49:42 UTC] PHP Notice: Undefined index: quantity in /<my directory>/public_html/wp-content/plugins/wpc-composite-products/wpc-composite-products.php on line 1572
       [16-Aug-2021 08:49:42 UTC] PHP Notice: Undefined index: data in /<my directory>/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php on line 688
       [16-Aug-2021 08:49:42 UTC] PHP Fatal error: Uncaught Error: Call to a member function get_stock_managed_by_id() on null in /<my directory>/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php:689
       Stack trace:
       #0 /<my directory>/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php(1218): WC_Cart->get_cart_item_quantities()
       #1 /<my directory>/public_html/wp-content/plugins/wpc-composite-products/wpc-composite-products.php(1493): WC_Cart->add_to_cart(405, 1, 0, Array, Array)
       #2 /<my directory>/public_html/wp-content/plugins/wpc-composite-products/wpc-composite-products.php(1457): WPCleverWooco->wooco_add_to_cart_items(Array, '4d09277658b56dc...', 1361, 1)
       #3 /<my directory>/public_html/wp-includes/class-wp-hook.php(303): WPCleverWooco->wooco_add_to_cart('4d09277658b56dc...', 1361, 1, 0, Array, Array)
       #4 /<my directory>/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filte in /<my directory>/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart.php on line 689
       [16-Aug-2021 08:49:42 UTC] PHP Notice: Undefined index: quantity in /<my directory>/public_html/wp-content/plugins/wpc-composite-products/wpc-composite-products.php on line 1572
       [16-Aug-2021 08:49:42 UTC] PHP Notice: Undefined index: quantity in /<my directory>/public_html/wp-includes/class-wp-list-util.php on line 168
       [16-Aug-2021 08:49:42 UTC] PHP Notice: Undefined index: quantity in /<my directory>/public_html/wp-content/plugins/wpc-composite-products/wpc-composite-products.php on line 1572
       [16-Aug-2021 08:49:42 UTC] PHP Notice: Undefined index: quantity in /<my directory>/public_html/wp-content/plugins/wpc-composite-products/wpc-composite-products.php on line 1572
       ```
   

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 * 0 replies
 * 1 participant
 * Last reply from: [Lusmo](https://wordpress.org/support/users/vincentchow/)
 * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/undefined-index-uncaught-error/)
 * Status: not resolved