diff --git a/weed/util/bytes.go b/weed/util/bytes.go
index 43008c42f..4e9ce1d15 100644
--- a/weed/util/bytes.go
+++ b/weed/util/bytes.go
@@ -33,6 +33,9 @@ func BytesToHumanReadable(b uint64) string {
 
 func BytesToUint64(b []byte) (v uint64) {
 	length := uint(len(b))
+	if length == 0 {
+		return 0
+	}
 	for i := uint(0); i < length-1; i++ {
 		v += uint64(b[i])
 		v <<= 8
@@ -42,6 +45,9 @@ func BytesToUint64(b []byte) (v uint64) {
 }
 func BytesToUint32(b []byte) (v uint32) {
 	length := uint(len(b))
+	if length == 0 {
+		return 0
+	}
 	for i := uint(0); i < length-1; i++ {
 		v += uint32(b[i])
 		v <<= 8
@@ -50,9 +56,15 @@ func BytesToUint32(b []byte) (v uint32) {
 	return
 }
 func BytesToUint16(b []byte) (v uint16) {
-	v += uint16(b[0])
-	v <<= 8
-	v += uint16(b[1])
+	length := uint(len(b))
+	if length == 0 {
+		return 0
+	}
+	for i := uint(0); i < length-1; i++ {
+		v += uint16(b[i])
+		v <<= 8
+	}
+	v += uint16(b[length-1])
 	return
 }
 func Uint64toBytes(b []byte, v uint64) {