diff --git a/ChangeLog b/ChangeLog
index 0b13d9c..ce07d35 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2019-05-30 Alibaba Cloud.
+	* VERSION: 1.6.4
+	* BUGFIX: fix bug of `GetDetailedInfo` panic.
 2019-05-26 Alibaba Cloud.
 	* VERSION: 1.6.3
 	* IMPROVE: target address supports cluster.
diff --git a/src/redis-shake/sync.go b/src/redis-shake/sync.go
index 5d47729..bf87590 100644
--- a/src/redis-shake/sync.go
+++ b/src/redis-shake/sync.go
@@ -61,6 +61,9 @@ type CmdSync struct {
 func (cmd *CmdSync) GetDetailedInfo() interface{} {
 	ret := make([]map[string]interface{}, len(cmd.dbSyncers))
 	for i, syncer := range cmd.dbSyncers {
+		if syncer == nil {
+			continue
+		}
 		ret[i] = syncer.GetExtraInfo()
 	}
 	return ret