Error when vendor is rejecting refund

[moumitahalder]

Fatal error: Uncaught Error: Call to a member function add_order_note() on bool in /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/class-mvx-vendor-dashboard.php:3021 Stack trace: #0 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/class-mvx-vendor-hooks.php(870): MVX_Admin_Dashboard->save_handler_vendor_orders() #1 /home/dev/public_html/mvx1/wp-includes/class-wp-hook.php(324): MVX_Vendor_Hooks->save_vendor_dashboard_data() #2 /home/dev/public_html/mvx1/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #3 /home/dev/public_html/mvx1/wp-includes/plugin.php(517): WP_Hook->do_action() #4 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/templates/shortcode/vendor_dashboard.php(17): do_action() #5 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/class-mvx-template.php(38): include('...') #6 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/shortcode/class-mvx-shortcode-vendor-dashboard.php(48): MVX_Template->get_template() #7 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/class-mvx-shortcode.php(89): MVX_Vendor_Dashboard_Shortcode::output() #8 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/class-mvx-shortcode.php(57): MVX_Shortcode::shortcode_wrapper() #9 /home/dev/public_html/mvx1/wp-includes/shortcodes.php(433): MVX_Shortcode::mvx_vendor_dashboard_shortcode() #10 [internal function]: do_shortcode_tag() #11 /home/dev/public_html/mvx1/wp-includes/shortcodes.php(273): preg_replace_callback() #12 /home/dev/public_html/mvx1/wp-includes/class-wp-hook.php(324): do_shortcode() #13 /home/dev/public_html/mvx1/wp-includes/plugin.php(205): WP_Hook->apply_filters() #14 /home/dev/public_html/mvx1/wp-includes/post-template.php(256): apply_filters() #15 /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/templates/template-vendor-dashboard.php(36): the_content() #16 /home/dev/public_html/mvx1/wp-includes/template-loader.php(106): include('...') #17 /home/dev/public_html/mvx1/wp-blog-header.php(19): require_once('...') #18 /home/dev/public_html/mvx1/index.php(17): require('...') #19 {main} thrown in /home/dev/public_html/mvx1/wp-content/plugins/dc-woocommerce-multi-vendor/classes/class-mvx-vendor-dashboard.php on line 3021