diff --git a/includes/admin/meta-boxes/class-wc-meta-box-product-images.php b/includes/admin/meta-boxes/class-wc-meta-box-product-images.php
index 2b856a7ff40..6a7f4b9e78d 100644
--- a/includes/admin/meta-boxes/class-wc-meta-box-product-images.php
+++ b/includes/admin/meta-boxes/class-wc-meta-box-product-images.php
@@ -64,7 +64,7 @@ class WC_Meta_Box_Product_Images {
 	 * Save meta box data
 	 */
 	public static function save( $post_id, $post ) {
-		$attachment_ids = array_filter( explode( ',', wc_clean( $_POST['product_image_gallery'] ) ) );
+		$attachment_ids = isset( $_POST['product_image_gallery'] ) ? array_filter( explode( ',', wc_clean( $_POST['product_image_gallery'] ) ) ) : array();
 
 		update_post_meta( $post_id, '_product_image_gallery', implode( ',', $attachment_ids ) );
 	}