diff --git a/taskman.go b/taskman.go
index 7b237db..a4747f8 100644
--- a/taskman.go
+++ b/taskman.go
@@ -45,7 +45,14 @@ func (t *TaskMan) Put(cf *changedFile) {
 }
 
 func (t *TaskMan) preRun(cf *changedFile) {
-	if t.cmd != nil && t.cmd.Process != nil && t.cmd.ProcessState != nil && !t.cmd.ProcessState.Exited() {
+	log.Println("preRun ...", t.cmd)
+	log.Println(t.cmd != nil)
+	if t.cmd != nil {
+		log.Println(t.cmd.Process != nil)
+		//log.Println(t.cmd.ProcessState != nil)
+		//log.Println(!t.cmd.ProcessState.Exited())
+	}
+	if t.cmd != nil && t.cmd.Process != nil {
 		log.Println("stop old process ")
 		if err := t.cmd.Process.Kill(); err != nil {
 			log.Println(PreWarn, "stopped err, reason:", err)