diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 87676998a..29fe25e00 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -884,7 +884,7 @@ def heuristicCheckDbms(injection):
 
         Backend.forceDbms(dbms)
 
-        if (randStr1 in unescaper.escape("'%s'" % randStr1)) and dbms not in FROM_DUMMY_TABLE:
+        if (randStr1 in unescaper.escape("'%s'" % randStr1)) and FROM_DUMMY_TABLE.values().count(FROM_DUMMY_TABLE.get(dbms, "")) != 1:
             continue
 
         if checkBooleanExpression("(SELECT '%s'%s)=%s%s%s" % (randStr1, FROM_DUMMY_TABLE.get(dbms, ""), SINGLE_QUOTE_MARKER, randStr1, SINGLE_QUOTE_MARKER)):
diff --git a/lib/core/settings.py b/lib/core/settings.py
index b1a2835ad..fdf25a0e5 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 = "1.4.1.38"
+VERSION = "1.4.1.39"
 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)