avoid set value to root

store/tree.go

@@ -57,6 +57,11 @@ func (t *tree) set(key string, value Node) bool {
 
 	nodesName := split(key)
 
+	// avoid set value to "/"
+	if len(nodesName) == 1 && len(nodesName[0]) == 0 {
+		return false
+	}
+
 	nodeMap := t.Root.NodeMap
 
 	i := 0