Function keeps sending a blank row

Question

Im trying to make this part.

$groups_user = new Groups_User( $user_id );
$orders_group[$groups_user->groups[0]->group->name][] = $order_id;

Part of the larger

 case 'Summary list':
                    foreach ( $order_ids as $order_id ) {
                        $user_id = get_post_meta($order_id, '_customer_user', true);
                        $groups_user = new Groups_User( $user_id );
                        $orders_group[$groups_user->groups[0]->group->name][$user_id][] = $order_id;
                    }

                    $i = 1;
                    foreach ($orders_group as $group => $users) {

Work with this part

 foreach ( $order_ids as $order_id ) {
                        $order = wc_get_order( $order_id );
                        $user_id = $order->get_user_id();
                        if(array_key_exists($order->get_user_id(), $orders_group)) {
                            $orders_group[$user_id]['order_ids'][] = $order_id;
                        } else {
                            $orders_group[$user_id]['order'] = $order;
                            $orders_group[$user_id]['order_ids'][] = $order_id;
                        }

                    }
                    $og_count = count($orders_group);
                    $og_i = 1;
                    foreach ($orders_group as $user_id => $data) {

To my understanding is that the first part $order_id conflicts with the last part $order_id because they are used to define different things. However

$groups_user = new Groups_User( $user_id );
$orders_group[$groups_user->groups[0]->group->name][] = $order_id;

$groups_user pulls the data i need to display i just cant get it to work with the lower part. It keeps sending out a blank row

How can i make that one part work with the other to display what i need? Thank you in advance.