change SopRun to a variable

@@ -24,6 +24,10 @@ import (
 	"github.com/astaxie/beego/session"
 )
 
+var (
+	USERSTOPRUN = errors.New("User stop run")
+)
+
 type Controller struct {
 	Ctx           *context.Context
 	Data          map[interface{}]interface{}
@@ -181,7 +185,7 @@ func (c *Controller) Abort(code string) {
 }
 
 func (c *Controller) StopRun() {
-	panic("StopRun")
+	panic(USERSTOPRUN)
 }
 
 func (c *Controller) UrlFor(endpoint string, values ...string) string {

@@ -369,7 +369,7 @@ func (p *ControllerRegistor) UrlFor(endpoint string, values ...string) string {
 func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 	defer func() {
 		if err := recover(); err != nil {
-			if fmt.Sprint(err) == "StopRun" {
+			if err == USERSTOPRUN {
 				return
 			}
 			if _, ok := err.(middleware.HTTPException); ok {