diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 4ab2fef21..4ba0079f1 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -537,7 +537,7 @@ def checkSqlInjection(place, parameter, value):
 
                                     injectable = True
 
-                                elif threadData.lastComparisonRatio > UPPER_RATIO_BOUND and not any((conf.string, conf.notString, conf.regexp, conf.code, kb.nullConnection)):
+                                elif (threadData.lastComparisonRatio or 0) > UPPER_RATIO_BOUND and not any((conf.string, conf.notString, conf.regexp, conf.code, kb.nullConnection)):
                                     originalSet = set(getFilteredPageContent(kb.pageTemplate, True, "\n").split("\n"))
                                     trueSet = set(getFilteredPageContent(truePage, True, "\n").split("\n"))
                                     falseSet = set(getFilteredPageContent(falsePage, True, "\n").split("\n"))
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 396443e9e..8546f20cd 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 = "1.3.5.76"
+VERSION = "1.3.5.77"
 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)