diff --git a/lib/core/settings.py b/lib/core/settings.py
index 07a82ee31..c4dbdb0c4 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -18,7 +18,7 @@ from lib.core.enums import OS
 from thirdparty import six
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.3.5.19"
+VERSION = "1.3.5.20"
 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/request/connect.py b/lib/request/connect.py
index 378df4af7..dccbd0baf 100644
--- a/lib/request/connect.py
+++ b/lib/request/connect.py
@@ -416,9 +416,10 @@ class Connect(object):
 
             for key, value in list(headers.items()):
                 del headers[key]
-                for char in (r"\r", r"\n"):
-                    value = re.sub(r"(%s)([^ \t])" % char, r"\g<1>\t\g<2>", value)
-                headers[getBytes(key)] = getBytes(value.strip("\r\n"))
+                if isinstance(value, six.string_types):
+                    for char in (r"\r", r"\n"):
+                        value = re.sub(r"(%s)([^ \t])" % char, r"\g<1>\t\g<2>", value)
+                    headers[getBytes(key)] = getBytes(value.strip("\r\n"))
 
             if six.PY2:
                 url = getBytes(url)  # Note: Python3 requires text while Python2 has problems when mixing text with binary POST