diff --git a/blobstore/common/rpc2/request.go b/blobstore/common/rpc2/request.go
index 43da70413..e2530737f 100644
--- a/blobstore/common/rpc2/request.go
+++ b/blobstore/common/rpc2/request.go
@@ -86,6 +86,9 @@ func (req *Request) ParseParameter(para Unmarshaler) error {
 	if len(req.Parameter) > 0 {
 		return para.Unmarshal(req.Parameter[:])
 	}
+	if req.ContentLength == 0 {
+		return para.Unmarshal(nil)
+	}
 	_, err := req.Body.WriteTo(LimitWriter(Codec2Writer(para, int(req.ContentLength)), req.ContentLength))
 	if err != nil {
 		return NewError(400, "ParseParameter", err.Error())
diff --git a/blobstore/shardnode/storage/shard.go b/blobstore/shardnode/storage/shard.go
index e89f7bb27..b6e8d5359 100644
--- a/blobstore/shardnode/storage/shard.go
+++ b/blobstore/shardnode/storage/shard.go
@@ -783,10 +783,7 @@ func (s *shard) validateUnitUpdate(node clustermgr.ShardUnit) bool {
 		}
 	}
 	// prevent update shard unit not exist
-	if !exist {
-		return false
-	}
-	return true
+	return exist
 }
 
 func (s *shard) checkShardOptHeader(h OpHeader) error {