diff --git a/lib/core/agent.py b/lib/core/agent.py
index b4414d7d7..bbd90466f 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -39,6 +39,7 @@ from lib.core.settings import CUSTOM_INJECTION_MARK_CHAR
 from lib.core.settings import DEFAULT_COOKIE_DELIMITER
 from lib.core.settings import DEFAULT_GET_POST_DELIMITER
 from lib.core.settings import GENERIC_SQL_COMMENT
+from lib.core.settings import NULL
 from lib.core.settings import PAYLOAD_DELIMITER
 from lib.core.settings import REPLACEMENT_MARKER
 from lib.core.unescaper import unescaper
@@ -747,6 +748,9 @@ class Agent(object):
             intoRegExp = intoRegExp.group(1)
             query = query[:query.index(intoRegExp)]
 
+            position = 0
+            char = NULL
+
         for element in xrange(0, count):
             if element > 0:
                 unionQuery += ','
diff --git a/lib/core/settings.py b/lib/core/settings.py
index caf4fca3e..707666740 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from lib.core.enums import OS
 from lib.core.revision import getRevisionNumber
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.0.4.1"
+VERSION = "1.0.4.2"
 REVISION = getRevisionNumber()
 STABLE = VERSION.count('.') <= 2
 VERSION_STRING = "sqlmap/%s#%s" % (VERSION, "stable" if STABLE else "dev")