diff --git a/lib/core/settings.py b/lib/core/settings.py
index f8ae67c48..8ed2a6d9a 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 = "1.1.11.33"
+VERSION = "1.1.11.34"
 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/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index afa88ea38..aa88d17f4 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -461,15 +461,12 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                     threadData = getCurrentThreadData()
 
                     while kb.threadContinue:
-                        kb.locks.index.acquire()
+                        with kb.locks.index:
+                            if threadData.shared.index[0] - firstChar >= length:
+                                return
 
-                        if threadData.shared.index[0] - firstChar >= length:
-                            kb.locks.index.release()
-                            return
-
-                        threadData.shared.index[0] += 1
-                        currentCharIndex = threadData.shared.index[0]
-                        kb.locks.index.release()
+                            threadData.shared.index[0] += 1
+                            currentCharIndex = threadData.shared.index[0]
 
                         if kb.threadContinue:
                             charStart = time.time()
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 31b35a02a..e238a3ed7 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -46,7 +46,7 @@ e1c000db9be27f973569b1a430629037  lib/core/option.py
 760d9df2a27ded29109b390ab202e72d  lib/core/replication.py
 a2466b62e67f8b31736bac4dac590e51  lib/core/revision.py
 02d4762140a72fd44668d3dab5eabda9  lib/core/session.py
-8269d14ad7ba23bf255f355add19eaa5  lib/core/settings.py
+34bc58ea008c92da42e79a18fce3ec9c  lib/core/settings.py
 35bffbad762eb9e03db9e93b1c991103  lib/core/shell.py
 a59ec28371ae067a6fdd8f810edbee3d  lib/core/subprocessng.py
 d5a04d672a18f78deb2839c3745ff83c  lib/core/target.py
@@ -87,7 +87,7 @@ ac3f47b2f8d2cd530512405b4a23a9db  lib/takeover/metasploit.py
 21b6eff33f5d28c5e167a948976817cb  lib/takeover/udf.py
 e49d1213f9ae0c0f922c5aef4febe205  lib/takeover/web.py
 d3080bf68b4b85ed2c98af5de74e8b73  lib/takeover/xp_cmdshell.py
-ab58650253fdad04e7a53a4e4d36df8a  lib/techniques/blind/inference.py
+ed995f2c65aab9f222005493b590eb2d  lib/techniques/blind/inference.py
 5fb9aaf874daa47ea2b672a22740e56b  lib/techniques/blind/__init__.py
 5fb9aaf874daa47ea2b672a22740e56b  lib/techniques/dns/__init__.py
 95331b2826f28db9ff962670391aa7d6  lib/techniques/dns/test.py