PHP warnings

Hi, I have an online store based on WordPress 6.4.3 and WooCommerce 8.7.0. The Qty Increment Buttons for WooCommerce plugin generates the following warnings:

Warning: Undefined array key “all_pages” in wp-content/plugins/qty-increment-buttons-for-woocommerce/qty-increment-buttons-for-woocommerce.php on line 408

Warning: Undefined array key “quantity_width” in wp-content/plugins/qty-increment-buttons-for-woocommerce/qty-increment-buttons-for-woocommerce.php on line 755

Warning: Undefined array key “auto_table” in wp-content/plugins/qty-increment-buttons-for-woocommerce/qty-increment-buttons-for-woocommerce.php on line 774

Have any of you encountered the above errors and know how to solve them? Is there any additional information needed to locate the error?