Coupon for all products & vendors

Hi.
How can I create a coupon in woocommerce dashboard and works for all vendors?
When I create a coupon I get this message when I apply my coupon code:
A coupon must be restricted with a vendor product.
i am comment out this line , but not work!
add_filter( 'woocommerce_coupon_is_valid', array( $this, 'ensure_vendor_coupon' ), 10, 3 );