@@ -4,6 +4,7 @@ package native

 import (

 	"encoding/json"

+	"errors"

 	"fmt"

 	"io"

 	"io/ioutil"

@@ -173,6 +174,9 @@ func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallba

 }

 func (d *driver) Kill(p *execdriver.Command, sig int) error {

+	if p.ProcessConfig.Process == nil {

+		return errors.New("exec: not started")

+	}

 	return syscall.Kill(p.ProcessConfig.Process.Pid, syscall.Signal(sig))

 }