Fatal Error on line 1033 hooks-n-filters.php

hooks-n-filters.php

<?php 
add_action( 'woocommerce_subscriptions_updated_users_role', 'st_woocommerce_subscriptions_updated_users_role', 11, 3 );
function st_woocommerce_subscriptions_updated_users_role( $role_new, $user, $role_old ) {
	
	$_pf = new WC_Product_Factory();
	
	if ( 'member_going_in' == $role_new || WC_Subscriptions_Manager::user_has_subscription( $user->ID, '', 'active') ) {
		
		$subscriptions = wcs_get_users_subscriptions($user->ID);
		
		foreach ( $subscriptions as $subscription ) {

			$order = new WC_Order( $subscription->get_parent_id() );
			$items = $order->get_items();
			
			$first_item = array_shift($items);
			
			$_product = $_pf->get_product($first_item->get_product_id());  // This is line 1033 in my file
			$attributes = $_product->get_attributes();
			
			/* -- irrelevant code here -- */
			
		}
		
		/* -- irrelevant code here -- */
		
	} else if ( 'member_going_out' == $role_new ) {
		
		/* -- irrelevant code here -- */
		
	}
}