arnone

Ok, I’ve just add this code and everything is ok now 🙂 :

Global $wpdb;
		$value = apply_filters( 'woocommerce_reports_sales_overview_order_items', absint( $wpdb->get_var( "
		SELECT SUM( order_item_meta.meta_value )
		FROM {$wpdb->prefix}woocommerce_order_items as order_items
		LEFT JOIN {$wpdb->prefix}woocommerce_order_itemmeta as order_item_meta ON order_items.order_item_id = order_item_meta.order_item_id
		LEFT JOIN {$wpdb->posts} AS posts ON order_items.order_id = posts.ID
		LEFT JOIN {$wpdb->term_relationships} AS rel ON posts.ID = rel.object_ID
		LEFT JOIN {$wpdb->term_taxonomy} AS tax USING( term_taxonomy_id )
		LEFT JOIN {$wpdb->terms} AS term USING( term_id )
		WHERE 	term.slug IN ('" . implode( "','", apply_filters( 'woocommerce_reports_order_statuses', array( 'completed', 'processing', 'on-hold' ) ) ) . "')
		AND 	posts.post_status 	= 'publish'
		AND 	tax.taxonomy		= 'shop_order_status'
		AND 	order_items.order_item_type = 'line_item'
		AND 	order_item_meta.meta_key = '_qty'
	" ) ) );