diff --git a/lib/core/settings.py b/lib/core/settings.py
index 08da8e334..57015d407 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 = "1.2.5.11"
+VERSION = "1.2.5.12"
 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/inject.py b/lib/request/inject.py
index cfe69a6ba..89cfbd0d4 100644
--- a/lib/request/inject.py
+++ b/lib/request/inject.py
@@ -77,6 +77,9 @@ def _goInference(payload, expression, charsetType=None, firstChar=None, lastChar
 
     value = _goDns(payload, expression)
 
+    if payload is None:
+        return None
+
     if value is not None:
         return value
 
diff --git a/lib/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index 2783231f5..e08c5b6c6 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -69,6 +69,9 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
     finalValue = None
     retrievedLength = 0
 
+    if payload is None:
+        return 0, None
+
     if charsetType is None and conf.charset:
         asciiTbl = sorted(set(ord(_) for _ in conf.charset))
     else:
@@ -187,7 +190,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
             with hintlock:
                 hintValue = kb.hintValue
 
-            if hintValue is not None and len(hintValue) >= idx:
+            if payload is not None and hintValue is not None and len(hintValue) >= idx:
                 if Backend.getIdentifiedDbms() in (DBMS.SQLITE, DBMS.ACCESS, DBMS.MAXDB, DBMS.DB2):
                     posValue = hintValue[idx - 1]
                 else:
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index fe51dbdc1..b77d3e04a 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -47,7 +47,7 @@ c9a56e58984420a5abb7a3f7aadc196d  lib/core/optiondict.py
 0c3eef46bdbf87e29a3f95f90240d192  lib/core/replication.py
 a7db43859b61569b601b97f187dd31c5  lib/core/revision.py
 fcb74fcc9577523524659ec49e2e964b  lib/core/session.py
-5685eacb5dd1a67c8e30b85b7ead70a9  lib/core/settings.py
+28b7ef08849aa6d4f652a9d1c58ca8f2  lib/core/settings.py
 0dfc2ed40adf72e302291f6ecd4406f6  lib/core/shell.py
 a7edc9250d13af36ac0108f259859c19  lib/core/subprocessng.py
 6306284edcccc185b2df085438572b0d  lib/core/target.py
@@ -74,7 +74,7 @@ dd4598675027fae99f2e2475b05986da  lib/request/direct.py
 2044fce3f4ffa268fcfaaf63241b1e64  lib/request/dns.py
 eee965d781546d05f36cfd14af050913  lib/request/httpshandler.py
 1e5532ede194ac9c083891c2f02bca93  lib/request/__init__.py
-b188a11542a996276abbbc48913501c3  lib/request/inject.py
+c2fb1abbb7127ec6419bbf852c0a458d  lib/request/inject.py
 aaf956c1e9855836c3f372e29d481393  lib/request/methodrequest.py
 51eeaa8abf5ba62aaaade66d46ff8b00  lib/request/pkihandler.py
 2c3774b72586985719035b195f144d7b  lib/request/rangehandler.py
@@ -88,7 +88,7 @@ fb9e34d558293b5d6b9727f440712886  lib/takeover/registry.py
 48575dde7bb867b7937769f569a98309  lib/takeover/udf.py
 2665fa7eedb19a1b10ffe949999b75f1  lib/takeover/web.py
 f1decf0a987bd3a4bc757212cbe6a6c8  lib/takeover/xp_cmdshell.py
-2543e14cc7f6e239b49dd40f41bc34fa  lib/techniques/blind/inference.py
+4a7f231e597f754e9fcd116d13ad1a4d  lib/techniques/blind/inference.py
 1e5532ede194ac9c083891c2f02bca93  lib/techniques/blind/__init__.py
 1e5532ede194ac9c083891c2f02bca93  lib/techniques/dns/__init__.py
 799faf9008527d2e9da9d923e50f685a  lib/techniques/dns/test.py