From fb584d25dbb571e83e215de4498145754de9c022 Mon Sep 17 00:00:00 2001
From: "zezhou.yu" <ray.zezhou@gmail.com>
Date: Thu, 8 Dec 2016 01:34:22 +0800
Subject: [PATCH] fix cmdInfo nil pointer panic

---
 cluster.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cluster.go b/cluster.go
index 571d5c3..673f3ff 100644
--- a/cluster.go
+++ b/cluster.go
@@ -1,6 +1,7 @@
 package redis
 
 import (
+	"fmt"
 	"math/rand"
 	"sync"
 	"sync/atomic"
@@ -371,7 +372,9 @@ func (c *ClusterClient) cmdSlotAndNode(state *clusterState, cmd Cmder) (int, *cl
 		return -1, node, err
 	}
 	slot := hashtag.Slot(firstKey)
-
+	if cmdInfo == nil {
+		return -1, nil, internal.RedisError(fmt.Sprintf("cmdInfo of %s is nil", cmd.arg(0)))
+	}
 	if cmdInfo.ReadOnly && c.opt.ReadOnly {
 		if c.opt.RouteByLatency {
 			node, err := state.slotClosestNode(slot)