diff --git a/toolbox/statistics.go b/toolbox/statistics.go
index 69b88772..c6a9489f 100644
--- a/toolbox/statistics.go
+++ b/toolbox/statistics.go
@@ -117,7 +117,9 @@ func (m *URLMap) GetMap() map[string]interface{} {
 
 // GetMapData return all mapdata
 func (m *URLMap) GetMapData() []map[string]interface{} {
-
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	
 	var resultLists []map[string]interface{}
 
 	for k, v := range m.urlmap {