Undefined index during order cancellation

  • Notice: Undefined index: redirect in /var/www/html/project_a/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php on line 641

    The above error is being constantly thrown when the exact following steps are followed:

    1. Checkout through PayPal
    2. When on PayPal site, cancel order
    3. When back to original site, modify a filter from WOOF Products Filter

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