Error while creating or updating product

Warning: Undefined array key “b2bking_group_b2c_pricetiers_price” in /wp-content/plugins/b2bking-wholesale-for-woocommerce/admin/class-b2bking-admin.php on line 4930

Fatal error: Uncaught TypeError: array_map(): Argument #2 ($array) must be of type array, null given in wp-content/plugins/b2bking-wholesale-for-woocommerce/admin/class-b2bking-admin.php:4930 Stack trace: #0 /wp-content/plugins/b2bking-wholesale-for-woocommerce/admin/class-b2bking-admin.php(4930): array_map() #1 e/wp-includes/class-wp-hook.php(305): B2bkingcore_Admin->b2bking_individual_product_pricing_data_save() #2 /wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #3 /wp-includes/plugin.php(470): WP_Hook->do_action() #4 wp-content/plugins/woocommerce/includes/admin/class-wc-admin-meta-boxes.php(224): do_action() #5 /wp-includes/class-wp-hook.php(305): WC_Admin_Meta_Boxes->save_meta_boxes() #6 /wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #7 /wp-includes/plugin.php(470): WP_Hook->do_action() #8 /wp-includes/post.php(4468): do_action() #9 /wp-includes/post.php(4570): wp_insert_post() #10 /wp-admin/includes/post.php(423): wp_update_post() #11 /wp-admin/post.php(227): edit_post() #12 {main} thrown in/wp-content/plugins/b2bking-wholesale-for-woocommerce/admin/class-b2bking-admin.php on line 4930