Fatal error from plugin

Hi ,

I have installed the premium version and now I have this error

Fatal error: Uncaught Error: Call to a member function get_displayed_subtotal() on null in /home/customer/www/bongmania.com.au/public_html/wp-content/plugins/woocommerce-free-shipping-bar/includes/data.php:288 Stack trace: #0 /home/customer/www/bongmania.com.au/public_html/wp-content/plugins/woocommerce-free-shipping-bar/includes/data.php(736): WFSPB_Data->get_total(‘no’) #1 /home/customer/www/bongmania.com.au/public_html/wp-content/plugins/woocommerce-free-shipping-bar/wfspb-front-end.php(346): WFSPB_Data->enqueue_script_frontend() #2 /home/customer/www/bongmania.com.au/public_html/wp-includes/class-wp-hook.php(303): WFSPB_FrontEnd->enqueue_script_for_main_bar(”) #3 /home/customer/www/bongmania.com.au/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #4 /home/customer/www/bongmania.com.au/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #5 /home/customer/www/bongmania.com.au/public_html/wp-includes/script-loader.php(2083): do_action(‘wp_enqueue_scri…’) #6 /home/custo in /home/customer/www/bongmania.com.au/public_html/wp-content/plugins/woocommerce-free-shipping-bar/includes/data.php on line 288

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I needed to change the layout , I added custom css inside your custom tab in the plugin

#wfspb-main-content { font-size:1.3em; color:#0d4501; }
#wfspb-top-bar.top_bar { display:none !important;}

PS : I couldn’t find a way to not display the main bar and keep the small progress and the others.If you have a better option , please let me know.

Thank you