Try to add the following PHP code snippet to the child theme functions.php file to fix this

add_action(
	'woocommerce_before_template_part',
	function () {
		global $product;

		if ( wp_is_json_request() && ! $product ) {
			$random_product = new WP_Query(
				array(
					'posts_per_page' => '1',
					'post_type'      => 'product',
				)
			);

			while ( $random_product->have_posts() ) {
				$random_product->the_post();
				$product_id = get_the_ID();
			}

			wp_reset_postdata();

			$product = wc_get_product( $product_id );
		}
	}
);