diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 9e558a414..cf934a753 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -506,7 +506,7 @@ def checkSqlInjection(place, parameter, value):
                             falseRawResponse = "%s%s" % (falseHeaders, falsePage)
 
                             # Checking if there is difference between current FALSE, original and heuristics page (i.e. not used parameter)
-                            if not kb.negativeLogic:
+                            if not any((kb.negativeLogic, conf.string, conf.notString)):
                                 try:
                                     ratio = 1.0
                                     seqMatcher = getCurrentThreadData().seqMatcher
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 54268f719..fb4418c57 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 = "1.4.5.0"
+VERSION = "1.4.5.1"
 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)