diff --git a/lib/core/option.py b/lib/core/option.py
index 93a0ce40e..bad824008 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -2045,6 +2045,7 @@ def _setKnowledgeBaseAttributes(flushAll=True):
     kb.delayCandidates = TIME_DELAY_CANDIDATES * [0]
     kb.dep = None
     kb.disableHtmlDecoding = False
+    kb.disableShiftTable = False
     kb.dnsMode = False
     kb.dnsTest = None
     kb.docRoot = None
diff --git a/lib/core/settings.py b/lib/core/settings.py
index b4a70346c..0007ae9d9 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from thirdparty import six
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.6.9.0"
+VERSION = "1.6.9.1"
 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/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index a15b64de3..70bad65e0 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -274,9 +274,11 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
 
             originalTbl = type(charTbl)(charTbl)
 
-            if continuousOrder and shiftTable is None:
+            if kb.disableShiftTable:
+                shiftTable = None
+            elif continuousOrder and shiftTable is None:
                 # Used for gradual expanding into unicode charspace
-                shiftTable = [2, 2, 3, 3, 5, 4]
+                shiftTable = [2, 2, 3, 3, 3]
 
             if "'%s'" % CHAR_INFERENCE_MARK in payload:
                 for char in ('\n', '\r'):
@@ -358,6 +360,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                             kb.responseTimePayload = None
 
                     result = Request.queryPage(forgedPayload, timeBasedCompare=timeBasedCompare, raise404=False)
+
                     incrementCounter(getTechnique())
 
                     if not timeBasedCompare and getTechniqueData() is not None:
@@ -405,6 +408,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                                 maxChar = maxValue = charTbl[-1]
                                 minValue = charTbl[0]
                             else:
+                                kb.disableShiftTable = True
                                 return None
                         else:
                             retVal = minValue + 1