diff --git a/common/error.go b/common/error.go
index 23d2879..ede37f7 100644
--- a/common/error.go
+++ b/common/error.go
@@ -22,7 +22,8 @@ var (
     ErrOutOfCap         = errors.New("Out of the capability.")
     ErrNotConn          = errors.New("Did not connect to job server.")
     ErrFuncNotFound     = errors.New("The function was not found.")
-    ErrConnection     = errors.New("Connection error.")
+    ErrEmptyReading     = errors.New("Empty reading.")
+    ErrNoActiveAgent    = errors.New("No active agent.")
 )
 func DisablePanic() {recover()}
 
diff --git a/example/worker.go b/example/worker.go
index 9a19338..d5f162f 100644
--- a/example/worker.go
+++ b/example/worker.go
@@ -19,6 +19,7 @@ func main() {
     log.Println("Starting ...")
     defer log.Println("Shutdown complete!")
     w := worker.New(worker.Unlimited)
+    defer w.Close()
     w.ErrHandler = func(e error) {
         log.Println(e)
     }
diff --git a/worker/agent.go b/worker/agent.go
index 4e92209..a8ff6d2 100644
--- a/worker/agent.go
+++ b/worker/agent.go
@@ -48,7 +48,7 @@ func (a *agent) outLoop() {
 // inputing loop
 func (a *agent) inLoop() {
     defer func() {
-        a.conn.Close()
+        recover()
         close(a.in)
         close(a.out)
         a.worker.removeAgent(a)
@@ -86,6 +86,10 @@ func (a *agent) inLoop() {
     }
 }
 
+func (a *agent) Close() {
+    a.conn.Close()
+}
+
 func (a *agent) Work() {
     go a.outLoop()
     go a.inLoop()
diff --git a/worker/worker.go b/worker/worker.go
index 667e16e..35af432 100644
--- a/worker/worker.go
+++ b/worker/worker.go
@@ -159,6 +159,9 @@ func (worker *Worker) removeFunc(funcname string) {
 func (worker *Worker) Work() {
     defer func() {
         worker.running = false
+        for _, v := range worker.agents {
+            v.Close()
+        }
     }()
     for funcname, f := range worker.funcs {
         worker.addFunc(funcname, f.timeout)
@@ -168,8 +171,9 @@ func (worker *Worker) Work() {
         go v.Work()
     }
     ok := true
+    var job *Job
     for ok {
-        if job, ok := <-worker.in; ok {
+        if job, ok = <-worker.in; ok {
             switch job.DataType {
             case common.ERROR:
                 go func() {
@@ -280,6 +284,6 @@ func (worker *Worker) removeAgent(a *agent) {
         }
     }
     if len(worker.agents) == 0 {
-        worker.Close()
+        worker.err(common.ErrNoActiveAgent)
     }
 }