diff --git a/lib/core/settings.py b/lib/core/settings.py
index 67d495497..0b2b32c6e 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import DBMS_DIRECTORY_NAME
 from lib.core.enums import OS
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.1.12.16"
+VERSION = "1.1.12.17"
 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/lib/request/comparison.py b/lib/request/comparison.py
index 8e7bfc0c9..5d7cf902f 100644
--- a/lib/request/comparison.py
+++ b/lib/request/comparison.py
@@ -110,12 +110,17 @@ def _comparison(page, headers, code, getRatioValue, pageLength):
         elif isinstance(seqMatcher.a, unicode) and isinstance(page, str):
             seqMatcher.a = seqMatcher.a.encode(kb.pageEncoding or DEFAULT_PAGE_ENCODING, "ignore")
 
-        if seqMatcher.a and page and seqMatcher.a == page:
-            ratio = 1
+        if any(_ is None for _ in (page, seqMatcher.a)):
+            return None
+        elif seqMatcher.a and page and seqMatcher.a == page:
+            ratio = 1.
         elif kb.skipSeqMatcher or seqMatcher.a and page and any(len(_) > MAX_DIFFLIB_SEQUENCE_LENGTH for _ in (seqMatcher.a, page)):
-            ratio = 1.0 * len(seqMatcher.a) / len(page)
-            if ratio > 1:
-                ratio = 1. / ratio
+            if not page or not seqMatcher.a:
+                return float(seqMatcher.a == page)
+            else:
+                ratio = 1. * len(seqMatcher.a) / len(page)
+                if ratio > 1:
+                    ratio = 1. / ratio
         else:
             seq1, seq2 = None, None
 
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 972b26e6f..2f53d854d 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -46,7 +46,7 @@ f872699e948d0692ce11b54781da814c  lib/core/log.py
 760d9df2a27ded29109b390ab202e72d  lib/core/replication.py
 a2466b62e67f8b31736bac4dac590e51  lib/core/revision.py
 02d4762140a72fd44668d3dab5eabda9  lib/core/session.py
-6c134f0e75978056a01a6442bbef1ac8  lib/core/settings.py
+eed5329e23cee75adb1e14f825d29192  lib/core/settings.py
 35bffbad762eb9e03db9e93b1c991103  lib/core/shell.py
 a59ec28371ae067a6fdd8f810edbee3d  lib/core/subprocessng.py
 d93501771b41315f9fb949305b6ed257  lib/core/target.py
@@ -67,7 +67,7 @@ d8d9bcf9e7107a5e2cf2dd10f115ac28  lib/parse/payloads.py
 2b87577dc6d3609e96fc1e049def5b4f  lib/parse/sitemap.py
 d2f13a0e2fef5273d419d06e516122e1  lib/request/basicauthhandler.py
 4f8b3d682093fc577592e85999400149  lib/request/basic.py
-e0da70f14e9bff8288f14d903cfafb36  lib/request/comparison.py
+6ece5e32cc1496720af42a762bf8c3ee  lib/request/comparison.py
 ae823462aad7cd1081e6609192ba3109  lib/request/connect.py
 ad6f76839408d827abfcdc57813f8518  lib/request/direct.py
 4853bd0d523646315607a6a9a4c0b745  lib/request/dns.py