Merge pull request #29133 from woocommerce/fix/notice

Check if index value is set before accessing

includes/class-wc-checkout.php

@@ -747,7 +747,7 @@ class WC_Checkout {
 				$field_label = isset( $field['label'] ) ? $field['label'] : '';
 
 				if ( $validate_fieldset &&
-					'country' === $field['type'] &&
+					( isset( $field['type'] ) && 'country' === $field['type'] ) &&
 					! WC()->countries->country_exists( $data[ $key ] ) ) {
 						/* translators: ISO 3166-1 alpha-2 country code */
 						$errors->add( $key . '_validation', sprintf( __( "'%s' is not a valid country code.", 'woocommerce' ), $data[ $key ] ) );