diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 7b2a97fa3..9f0868fec 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -1359,7 +1359,7 @@ def checkWaf():
     conf.timeout = IDS_WAF_CHECK_TIMEOUT
 
     try:
-        retVal = Request.queryPage(place=place, value=value, getRatioValue=True, noteResponseTime=False, silent=True)[1] < IDS_WAF_CHECK_RATIO
+        retVal = Request.queryPage(place=place, value=value, getRatioValue=True, noteResponseTime=False, silent=True, disableTampering=True)[1] < IDS_WAF_CHECK_RATIO
     except SqlmapConnectionException:
         retVal = True
     finally:
diff --git a/lib/core/settings.py b/lib/core/settings.py
index cc1ec7e17..648531af8 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import DBMS_DIRECTORY_NAME
 from lib.core.enums import OS
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.2.4.12"
+VERSION = "1.2.4.13"
 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 358fa22b4..1c83c5ce7 100644
--- a/lib/request/connect.py
+++ b/lib/request/connect.py
@@ -770,7 +770,7 @@ class Connect(object):
 
     @staticmethod
     @stackedmethod
-    def queryPage(value=None, place=None, content=False, getRatioValue=False, silent=False, method=None, timeBasedCompare=False, noteResponseTime=True, auxHeaders=None, response=False, raise404=None, removeReflection=True):
+    def queryPage(value=None, place=None, content=False, getRatioValue=False, silent=False, method=None, timeBasedCompare=False, noteResponseTime=True, auxHeaders=None, response=False, raise404=None, removeReflection=True, disableTampering=False):
         """
         This method calls a function to get the target URL page content
         and returns its page ratio (0 <= ratio <= 1) or a boolean value
@@ -817,7 +817,7 @@ class Connect(object):
                 conf.httpHeaders.append((HTTP_HEADER.CONTENT_TYPE, contentType))
 
         if payload:
-            if kb.tamperFunctions:
+            if not disableTampering and kb.tamperFunctions:
                 for function in kb.tamperFunctions:
                     try:
                         payload = function(payload=payload, headers=auxHeaders)
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index cb3b7f417..f45269e14 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -21,7 +21,7 @@ c88d66597f4aab719bde4542b0a1a6e0  extra/shutils/regressiontest.py
 1e5532ede194ac9c083891c2f02bca93  extra/sqlharvest/__init__.py
 b3e60ea4e18a65c48515d04aab28ff68  extra/sqlharvest/sqlharvest.py
 0f581182871148b0456a691ae85b04c0  lib/controller/action.py
-5084b16b037ed8d29f594f6113fe78e3  lib/controller/checks.py
+56d325f83671146c28ac300ff553420f  lib/controller/checks.py
 c414cecdb0472c92cf50ed5b01e4438c  lib/controller/controller.py
 c7443613a0a2505b1faec931cee2a6ef  lib/controller/handler.py
 1e5532ede194ac9c083891c2f02bca93  lib/controller/__init__.py
@@ -46,7 +46,7 @@ c9a56e58984420a5abb7a3f7aadc196d  lib/core/optiondict.py
 0c3eef46bdbf87e29a3f95f90240d192  lib/core/replication.py
 a7db43859b61569b601b97f187dd31c5  lib/core/revision.py
 fcb74fcc9577523524659ec49e2e964b  lib/core/session.py
-16bc4ff0ccd5121f1b90016b5d759ef6  lib/core/settings.py
+8a247c468eef23045b8537d4ff98d823  lib/core/settings.py
 0dfc2ed40adf72e302291f6ecd4406f6  lib/core/shell.py
 a7edc9250d13af36ac0108f259859c19  lib/core/subprocessng.py
 a35efa7bec9f1e6cedf17c9830a79241  lib/core/target.py
@@ -68,7 +68,7 @@ ec4e56bbb1349176b2a22e0b99ba6a55  lib/parse/payloads.py
 30eed3a92a04ed2c29770e1b10d39dc0  lib/request/basicauthhandler.py
 7e8e0a3fdebbe443832c1bab2f8d3869  lib/request/basic.py
 c0cabedead14b8a23353b606672cff42  lib/request/comparison.py
-18052b8924b77eb2e772350b262aae88  lib/request/connect.py
+1865164621eb94c9c231006765065c17  lib/request/connect.py
 dd4598675027fae99f2e2475b05986da  lib/request/direct.py
 2044fce3f4ffa268fcfaaf63241b1e64  lib/request/dns.py
 eee965d781546d05f36cfd14af050913  lib/request/httpshandler.py