diff --git a/lib/core/settings.py b/lib/core/settings.py
index d8f724dd6..228ab123a 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -18,7 +18,7 @@ from lib.core.enums import OS
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.3.8.27"
+VERSION = "1.3.8.28"
 TYPE = "dev" if VERSION.count('.') > 2 and VERSION.split('.')[-1] != '0' else "stable"
 TYPE_COLORS = {"dev": 33, "stable": 90, "pip": 34}
 VERSION_STRING = "sqlmap/%s#%s" % ('.'.join(VERSION.split('.')[:-1]) if VERSION.count('.') > 2 and VERSION.split('.')[-1] == '0' else VERSION, TYPE)
diff --git a/lib/core/subprocessng.py b/lib/core/subprocessng.py
index 47ad47156..e0d99951f 100644
--- a/lib/core/subprocessng.py
+++ b/lib/core/subprocessng.py
@@ -13,6 +13,7 @@ import subprocess
 import time
 
 from lib.core.compat import buffer
+from lib.core.convert import getBytes
 from lib.core.settings import IS_WIN
 
 if IS_WIN:
@@ -192,6 +193,8 @@ def send_all(p, data):
     if not data:
         return
 
+    data = getBytes(data)
+
     while len(data):
         sent = p.send(data)
         if not isinstance(sent, int):