@@ -33,12 +33,10 @@ func (daemon *Daemon) ContainerAttach(prefixOrName string, req *backend.Containe

 		return err

 	}

 	if ctr.IsPaused() {

-		err := fmt.Errorf("container %s is paused, unpause the container before attach", prefixOrName)

-		return errdefs.Conflict(err)

+		return errdefs.Conflict(fmt.Errorf("container %s is paused, unpause the container before attach", prefixOrName))

 	}

 	if ctr.IsRestarting() {

-		err := fmt.Errorf("container %s is restarting, wait until the container is running", prefixOrName)

-		return errdefs.Conflict(err)

+		return errdefs.Conflict(fmt.Errorf("container %s is restarting, wait until the container is running", prefixOrName))

 	}

 	cfg := stream.AttachConfig{

@@ -51,8 +49,6 @@ func (daemon *Daemon) ContainerAttach(prefixOrName string, req *backend.Containe

 	}

 	ctr.StreamConfig.AttachStreams(&cfg)

-	multiplexed := !ctr.Config.Tty && req.MuxStreams

-

 	clientCtx, closeNotify := context.WithCancel(context.Background())

 	defer closeNotify()

 	go func() {

@@ -68,6 +64,7 @@ func (daemon *Daemon) ContainerAttach(prefixOrName string, req *backend.Containe

 		}

 	}()

+	multiplexed := !ctr.Config.Tty && req.MuxStreams

 	inStream, outStream, errStream, err := req.GetStreams(multiplexed, closeNotify)

 	if err != nil {

 		return err