renedchin on "[Plugin: WooCommerce] Woocommerce Warning: Missing argument 1 for get_query_var()"

Hi, Please help me how to solve my issue. I'm using Woocommerce, Woocommerce events and Stripe for credit card plugins.

When I'm checking out using Stripe (credit card). I'm having an error at the top of my order received page and it says:

Waing: Missing argument 1 for get_query_var(), called in /home/content/p3pnexwpnas07_data01/54/3214154/html/wp-content/plugins/woocommerce_events/classes/woohelper.php on line 688 and defined in /home/content/p3pnexwpnas07_data01/54/3214154/html/wp-includes/query.php on line 26

And after checking out it did go through my tickets in Woocommerce events but you will see 4 tickets appeared which is not because I'm just bought or order only one product.

Thanks in advance for you help.

https://wordpress.org/plugins/woocommerce/