diff --git a/weed/server/volume_grpc_erasure_coding.go b/weed/server/volume_grpc_erasure_coding.go
index 5981c5efe..88e94115d 100644
--- a/weed/server/volume_grpc_erasure_coding.go
+++ b/weed/server/volume_grpc_erasure_coding.go
@@ -492,7 +492,7 @@ func (vs *VolumeServer) VolumeEcShardsInfo(ctx context.Context, req *volume_serv
 			for _, shardDetail := range shardDetails {
 				ecShardInfo := &volume_server_pb.EcShardInfo{
 					ShardId:    uint32(shardDetail.ShardId),
-					Size:       shardDetail.Size,
+					Size:       int64(shardDetail.Size),
 					Collection: v.Collection,
 				}
 				ecShardInfos = append(ecShardInfos, ecShardInfo)
diff --git a/weed/server/volume_server_handlers_ui.go b/weed/server/volume_server_handlers_ui.go
index b1ff0317f..5679eb483 100644
--- a/weed/server/volume_server_handlers_ui.go
+++ b/weed/server/volume_server_handlers_ui.go
@@ -1,12 +1,14 @@
 package weed_server
 
 import (
-	"github.com/seaweedfs/seaweedfs/weed/pb"
-	"github.com/seaweedfs/seaweedfs/weed/util/version"
 	"net/http"
 	"path/filepath"
 	"time"
 
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/pb"
+	"github.com/seaweedfs/seaweedfs/weed/util/version"
+
 	"github.com/seaweedfs/seaweedfs/weed/pb/volume_server_pb"
 	ui "github.com/seaweedfs/seaweedfs/weed/server/volume_server_ui"
 	"github.com/seaweedfs/seaweedfs/weed/stats"
@@ -53,5 +55,8 @@ func (vs *VolumeServer) uiStatusHandler(w http.ResponseWriter, r *http.Request)
 		infos,
 		serverStats,
 	}
-	ui.StatusTpl.Execute(w, args)
+	if err := ui.StatusTpl.Execute(w, args); err != nil {
+		glog.Errorf("template execution error: %v", err)
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+	}
 }
diff --git a/weed/storage/erasure_coding/ec_volume.go b/weed/storage/erasure_coding/ec_volume.go
index 61057674f..839428e7b 100644
--- a/weed/storage/erasure_coding/ec_volume.go
+++ b/weed/storage/erasure_coding/ec_volume.go
@@ -178,9 +178,11 @@ func (ev *EcVolume) ShardSize() uint64 {
 	return 0
 }
 
-func (ev *EcVolume) Size() (size int64) {
+func (ev *EcVolume) Size() (size uint64) {
 	for _, shard := range ev.Shards {
-		size += shard.Size()
+		if shardSize := shard.Size(); shardSize > 0 {
+			size += uint64(shardSize)
+		}
 	}
 	return
 }
@@ -198,15 +200,18 @@ func (ev *EcVolume) ShardIdList() (shardIds []ShardId) {
 
 type ShardInfo struct {
 	ShardId ShardId
-	Size    int64
+	Size    uint64
 }
 
 func (ev *EcVolume) ShardDetails() (shards []ShardInfo) {
 	for _, s := range ev.Shards {
-		shards = append(shards, ShardInfo{
-			ShardId: s.ShardId,
-			Size:    s.Size(),
-		})
+		shardSize := s.Size()
+		if shardSize >= 0 {
+			shards = append(shards, ShardInfo{
+				ShardId: s.ShardId,
+				Size:    uint64(shardSize),
+			})
+		}
 	}
 	return
 }