Permanent error for guest after adding a 0 item to cart.

About product: Has tm extra product options but no way to get over $0
Steps: Select options where price = $0 > Add to cart > Error message shows > Refresh page and see wordpress error message. No way to get rid of it for that user without clearing all woocommerce carts

Errors:
#0 /home/customer/www/xxx.com/public_html/wp-content/plugins/woocommerce-tm-extra-product-options/include/classes/class-tm-epo-cart.php(985): THEMECOMPLETE_EPO_Cart->add_cart_item(Array, 'ec0aae9dbd99f72...')
#1 /home/customer/www/xxx.com/public_html/wp-includes/class-wp-hook.php(307): THEMECOMPLETE_EPO_Cart->woocommerce_get_cart_item_from_session(Array, Array, 'ec0aae9dbd99f72...')
#2 /home/customer/www/xxx.com/public_html/wp-includes/plugin.php(189): WP_Hook->apply_filters(Array, Array)
#3 /home/customer/www/xxx.com/public_html/wp-content/plugins/woocommerce/includes/class-wc-cart-session.php(163): apply_filters('woocommerce_get...', Array, Array, 'ec0aae9dbd99f72...')
#4 /home/customer/www/xxx.com/public_html/wp-content/plugins/woocomm in /home/customer/www/xxx.com/public_html/wp-content/plugins/woocommerce-tm-extra-product-options/include/classes/class-tm-epo-cart.php on line 793

#4 was not cut off, that is the full error message where it states plugins/woocomm and cuts off.

Version 5.1