diff --git a/server/analyseapi/riskmgr.go b/server/analyseapi/riskmgr.go
index f35023a..45f9316 100644
--- a/server/analyseapi/riskmgr.go
+++ b/server/analyseapi/riskmgr.go
@@ -298,6 +298,9 @@ func (this *RiskMgr) __analyseIsOpen(w* http.ResponseWriter, r *http.Request) {
 		atomic.AddInt64(&this.totalPassTimes, 1)
 		atomic.AddInt64(&this.passTimes, 1)
 		if this.clusterConf.GetTesting() == 1 {
+			if response_str == "" {
+				response_str = `""`
+			}
 			data := fmt.Sprintf(`{"errcode":0, "errmsg":"", "is_open":%d, "data":%s}`,
 				1,
 				response_str)
@@ -309,6 +312,9 @@ func (this *RiskMgr) __analyseIsOpen(w* http.ResponseWriter, r *http.Request) {
 		atomic.AddInt64(&this.totalBlockTimes, 1)
 		atomic.AddInt64(&this.blockTimes, 1)
 		if this.clusterConf.GetTesting() == 1 {
+			if response_str == "" {
+				response_str = `""`
+			}
 			data := fmt.Sprintf(`{"errcode":0, "errmsg":"", "is_open":%d, "data":%s}`,
 				0,
 				response_str)