diff --git a/memcache/selector.go b/memcache/selector.go
index 964dbdb..e4a1e67 100644
--- a/memcache/selector.go
+++ b/memcache/selector.go
@@ -93,6 +93,9 @@ func (ss *ServerList) SetServers(servers ...string) error {
 func (ss *ServerList) Each(f func(net.Addr) error) error {
 	ss.mu.RLock()
 	defer ss.mu.RUnlock()
+	if len(ss.addrs) == 0 {
+		return ErrNoServers
+	}
 	for _, a := range ss.addrs {
 		if err := f(a); nil != err {
 			return err