diff --git a/lib/core/agent.py b/lib/core/agent.py
index 539183e3f..26be9b450 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -222,7 +222,8 @@ class Agent(object):
             def _(pattern, repl, string):
                 retVal = string
                 match = None
-                for match in re.finditer(pattern, string):
+
+                for match in re.finditer(pattern, string or ""):
                     pass
 
                 if match:
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 4bdf462e4..119e3e4a6 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 = "1.7.6.3"
+VERSION = "1.7.6.4"
 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)