diff --git a/lib/core/common.py b/lib/core/common.py
index 4048efcf6..2496c7c69 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -21,6 +21,7 @@ import urlparse
 import ntpath
 import posixpath
 import subprocess
+import threading
 
 from ConfigParser import DEFAULTSECT
 from ConfigParser import RawConfigParser
@@ -1533,14 +1534,17 @@ def pushValue(value):
     Push value to the stack
     """
 
-    kb.valueStack.append(value)
+    threadId = threading.currentThread().ident
+    if threadId not in kb.valueStack:
+        kb.valueStack[threadId] = []
+    kb.valueStack[threadId].append(value)
 
 def popValue():
     """
     Pop value from the stack
     """
 
-    return kb.valueStack.pop()
+    return kb.valueStack[threading.currentThread().ident].pop()
 
 def wasLastRequestDBMSError():
     """
diff --git a/lib/core/option.py b/lib/core/option.py
index 09190fb8a..cb9a52645 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1118,7 +1118,6 @@ def __setConfAttributes():
     conf.sessionFP        = None
     conf.start            = True
     conf.tests            = []
-    conf.threadContinue   = True
     conf.threadException  = False
     conf.trafficFP        = None
     conf.wFileType        = None
@@ -1198,11 +1197,12 @@ def __setKnowledgeBaseAttributes(flushAll=True):
     kb.technique       = None
     kb.testMode        = False
     kb.testQueryCount  = 0
+    kb.threadContinue  = True
     kb.unionComment    = ""
     kb.unionCount      = None
     kb.unionPosition   = None
     kb.unionNegative   = False
-    kb.valueStack      = []
+    kb.valueStack      = {}
 
     if flushAll:
         kb.keywords        = set(getFileItems(paths.SQL_KEYWORDS))
diff --git a/lib/request/inject.py b/lib/request/inject.py
index e59db2077..b9488b3e4 100644
--- a/lib/request/inject.py
+++ b/lib/request/inject.py
@@ -422,7 +422,7 @@ def getValue(expression, blind=True, inband=True, error=True, time=True, fromUse
 
                 found = value or (value is None and expectingNone)
 
-            pushValue(kb.unionNegative)
+            oldUnionNegative = kb.unionNegative
             kb.unionNegative = False
 
             if error and isTechniqueAvailable(PAYLOAD.TECHNIQUE.ERROR) and not found:
@@ -456,7 +456,7 @@ def getValue(expression, blind=True, inband=True, error=True, time=True, fromUse
                 else:
                     value = __goInferenceProxy(query, fromUser, expected, batch, resumeValue, unpack, charsetType, firstChar, lastChar)
 
-            kb.unionNegative = popValue()
+            kb.unionNegative = oldUnionNegative
 
             if value and isinstance(value, basestring):
                 value = value.strip()
diff --git a/lib/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index 608d2c711..0a2a5ecc8 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -260,11 +260,11 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
         iolock  = threading.Lock()
         valuelock  = threading.Lock()
         kb.locks.seqLock = threading.Lock()
-        conf.threadContinue = True
+        kb.threadContinue = True
 
         def downloadThread():
             try:
-                while conf.threadContinue:
+                while kb.threadContinue:
                     idxlock.acquire()
 
                     if index[0] >= length:
@@ -276,7 +276,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                     curidx = index[0]
                     idxlock.release()
 
-                    if conf.threadContinue:
+                    if kb.threadContinue:
                         charStart = time.time()
                         val = getChar(curidx)
                         if val is None:
@@ -289,7 +289,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                     currentValue = list(value)
                     valuelock.release()
 
-                    if conf.threadContinue:
+                    if kb.threadContinue:
                         if showEta:
                             etaProgressUpdate(time.time() - charStart, index[0])
                         elif conf.verbose >= 1:
@@ -327,7 +327,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                             dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), replaceNewlineTabs(output, stdout=True)))
                             iolock.release()
 
-                if not conf.threadContinue:
+                if not kb.threadContinue:
                     if int(threading.currentThread().getName()) == numThreads - 1:
                         partialValue = unicode()
                         for v in value:
@@ -380,7 +380,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                         alive = True
                         thread.join(5)
         except KeyboardInterrupt:
-            conf.threadContinue = False
+            kb.threadContinue = False
             raise
 
         infoMsg = None