PHP warning

Hi, recently I found following warnings in my debug log after using your wonderful plugin:

[Jan 27, 23:03:40] PHP Warning:  Undefined array key 742 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:40] PHP Warning:  Undefined array key 750 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:40] PHP Warning:  Undefined array key 749 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:40] PHP Warning:  Undefined array key 747 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:40] PHP Warning:  Undefined array key 746 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:40] PHP Warning:  Undefined array key 745 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:40] PHP Warning:  Undefined array key 740 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:39] PHP Warning:  Undefined array key 741 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67
[Jan 27, 23:03:39] PHP Warning:  Undefined array key 748 in /wp-content/plugins/variation-duplicator-for-woocommerce/includes/class-woo-variation-image-clone.php on line 67

The server runs on PHP 8.0.