diff --git a/lib/core/common.py b/lib/core/common.py
index b35305b6a..0ce5c3d07 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -2664,7 +2664,7 @@ def extractErrorMessage(page):
 
             if match:
                 candidate = htmlUnescape(match.group("result")).replace("<br>", "\n").strip()
-                if (1.0 * len(re.findall(r"[^A-Za-z,. ]", candidate))) / len(candidate) > MIN_ERROR_PARSING_NON_WRITING_RATIO:
+                if candidate and (1.0 * len(re.findall(r"[^A-Za-z,. ]", candidate)) / len(candidate) > MIN_ERROR_PARSING_NON_WRITING_RATIO):
                     retVal = candidate
                     break
 
diff --git a/lib/core/settings.py b/lib/core/settings.py
index da46bf5c1..7a78d9ecb 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 = "1.3.6.51"
+VERSION = "1.3.6.52"
 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)