diff --git a/extra/vulnserver/vulnserver.py b/extra/vulnserver/vulnserver.py
index 696ede5e9..1bee82f08 100644
--- a/extra/vulnserver/vulnserver.py
+++ b/extra/vulnserver/vulnserver.py
@@ -12,6 +12,7 @@ from __future__ import print_function
 import re
 import sqlite3
 import sys
+import threading
 import traceback
 
 if sys.version_info >= (3, 0):
@@ -53,14 +54,17 @@ LISTEN_PORT = 8440
 
 _conn = None
 _cursor = None
+_lock = None
 _server = None
 
 def init(quiet=False):
     global _conn
     global _cursor
+    global _lock
 
     _conn = sqlite3.connect(":memory:", isolation_level=None, check_same_thread=False)
     _cursor = _conn.cursor()
+    _lock = threading.Lock()
 
     _cursor.executescript(SCHEMA)
 
@@ -116,11 +120,13 @@ class ReqHandler(BaseHTTPRequestHandler):
                 self.end_headers()
 
                 try:
-                    _cursor.execute("SELECT * FROM users WHERE id=%s LIMIT 0, 1" % self.params.get("id", ""))
+                    with _lock:
+                        _cursor.execute("SELECT * FROM users WHERE id=%s LIMIT 0, 1" % self.params.get("id", ""))
+                        results = _cursor.fetchall()
 
                     output = "<b>SQL results:</b>\n"
                     output += "<table border=\"1\">\n"
-                    for row in _cursor.fetchall():
+                    for row in results:
                         output += "<tr>"
                         for value in row:
                             output += "<td>%s</td>" % value
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 331e61fe2..d914bac38 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -17,7 +17,7 @@ from lib.core.enums import DBMS_DIRECTORY_NAME
 from lib.core.enums import OS
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.3.4.41"
+VERSION = "1.3.4.42"
 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/core/testing.py b/lib/core/testing.py
index e3c84c75b..0aa49d27b 100644
--- a/lib/core/testing.py
+++ b/lib/core/testing.py
@@ -20,7 +20,6 @@ import traceback
 from extra.beep.beep import beep
 from extra.vulnserver import vulnserver
 from lib.controller.controller import start
-from lib.core.common import checkIntegrity
 from lib.core.common import clearConsoleLine
 from lib.core.common import dataToStdout
 from lib.core.common import getUnicode
@@ -66,15 +65,16 @@ def vulnTest():
     thread.start()
 
     for options, checks in (
-        ("--identify-waf", ("CloudFlare",)),
+        ("--flush-session --identify-waf", ("CloudFlare",)),
         ("--flush-session", ("Type: boolean-based blind", "Type: time-based blind", "Type: UNION query", "back-end DBMS: SQLite", "3 columns")),
         ("--banner --schema --dump -T users --binary-fields=surname --where 'id>3'", ("banner: '3", "INTEGER", "TEXT", "id", "name", "surname", "2 entries", "6E616D6569736E756C6C")),
         ("--all --tamper=between,randomcase", ("5 entries", "luther", "blisset", "fluffy", "179ad45c6ce2cb97cf1029e212046e81", "NULL", "nameisnull", "testpass")),
-        ("--technique=B --hex --fresh-queries --sql-query='SELECT 987654321'", ("single-thread", ": '987654321'",)),
+        ("--technique=B --hex --fresh-queries --threads=4 --sql-query='SELECT 987654321'", ("length of query output", ": '987654321'",)),
         ("--technique=T --fresh-queries --sql-query='SELECT 1234'", (": '1234'",)),
     ):
         output = shellExec("python %s -u http://%s:%d/?id=1 --batch %s" % (os.path.join(os.path.dirname(__file__), "..", "..", "sqlmap.py"), address, port, options))
         if not all(check in output for check in checks):
+            print output
             retVal = False
 
         count += 1