diff --git a/lib/core/settings.py b/lib/core/settings.py
index ab1c823ee..b19971d3b 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 = "1.5.1.2"
+VERSION = "1.5.1.3"
 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/plugins/dbms/mysql/takeover.py b/plugins/dbms/mysql/takeover.py
index 12c73e901..23c391302 100644
--- a/plugins/dbms/mysql/takeover.py
+++ b/plugins/dbms/mysql/takeover.py
@@ -38,7 +38,7 @@ class Takeover(GenericTakeover):
 
         banVer = kb.bannerFp["dbmsVersion"]
 
-        if distutils.version.LooseVersion(banVer) >= distutils.version.LooseVersion("5.0.67"):
+        if banVer and distutils.version.LooseVersion(banVer) >= distutils.version.LooseVersion("5.0.67"):
             if self.__plugindir is None:
                 logger.info("retrieving MySQL plugin directory absolute path")
                 self.__plugindir = unArrayizeValue(inject.getValue("SELECT @@plugin_dir"))
diff --git a/plugins/dbms/postgresql/takeover.py b/plugins/dbms/postgresql/takeover.py
index 946fe5e1c..e1f6241a3 100644
--- a/plugins/dbms/postgresql/takeover.py
+++ b/plugins/dbms/postgresql/takeover.py
@@ -51,7 +51,10 @@ class Takeover(GenericTakeover):
 
         banVer = kb.bannerFp["dbmsVersion"]
 
-        if distutils.version.LooseVersion(banVer) >= distutils.version.LooseVersion("10"):
+        if not banVer:
+            errMsg = "unsupported feature on unknown version of PostgreSQL"
+            raise SqlmapUnsupportedFeatureException(errMsg)
+        elif distutils.version.LooseVersion(banVer) >= distutils.version.LooseVersion("10"):
             majorVer = banVer.split('.')[0]
         elif distutils.version.LooseVersion(banVer) >= distutils.version.LooseVersion("8.2") and '.' in banVer:
             majorVer = '.'.join(banVer.split('.')[:2])