diff --git a/common/bytes.go b/common/bytes.go
index 0342083a1e..04621b2583 100644
--- a/common/bytes.go
+++ b/common/bytes.go
@@ -39,6 +39,8 @@ func FromHex(s string) []byte {
 			s = "0" + s
 		}
 		return Hex2Bytes(s)
+	} else if len(s) == 1 {
+		return Hex2Bytes("0" + s)
 	}
 	return nil
 }