Fatal error for get_sku() on quotes.php

PHP Fatal error: Uncaught Error: Call to a member function get_sku() on null in l/wp-content/plugins/transdirect-shipping/includes/quotes.php:286

Stack trace:

0 /wp-content/plugins/transdirect-shipping/includes/order_sync.php(151): Quotes->td_get_cart_items(Array, false)

1 /wp-content/plugins/transdirect-shipping/includes/order_sync.php(237): order_sync->td_sync_all_orders(Object(WC_Order))

2 /wp-content/plugins/transdirect-shipping/transdirect_shipping.php(946): order_sync->td_create_order()

3 /wp-includes/class-wp-hook.php(308): td_my_repeat_function()

4 /wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(”, Array)

5 /wp-includes/plugin.php(565): WP_Hook->do_action(Array)

6 /wp-cron.php(188): do_action_ref_array(‘mycronjob’, Array)