diff --git a/core/bulkexport.class.inc.php b/core/bulkexport.class.inc.php
index 01453616a..cdf736728 100644
--- a/core/bulkexport.class.inc.php
+++ b/core/bulkexport.class.inc.php
@@ -25,7 +25,7 @@ define('EXPORTER_DEFAULT_CHUNK_SIZE', 1000);
 class BulkExportException extends Exception
 {
 	protected $sLocalizedMessage;
-	public function __construct($message, $sLocalizedMessage, $code = null, $previous = null)
+	public function __construct($message, $sLocalizedMessage, $code = 0, $previous = null)
 	{
 		parent::__construct($message, $code, $previous);
 		$this->sLocalizedMessage = $sLocalizedMessage;
diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 1fd22ee54..f3dad01f0 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -40,7 +40,7 @@ class DOMFormatException extends Exception
      * @param $previous
      * @param DesignElement|null $node DOMNode causing the DOMFormatException
      */
-    public function __construct($message, $code = null, $previous = null, DesignElement $node = null)
+    public function __construct($message, $code = 0, $previous = null, DesignElement $node = null)
     {
         if($node !== null)
         {
diff --git a/setup/modelfactory.class.inc.php b/setup/modelfactory.class.inc.php
index 708adcfc1..e670d086b 100644
--- a/setup/modelfactory.class.inc.php
+++ b/setup/modelfactory.class.inc.php
@@ -70,7 +70,7 @@ class MFException extends Exception
 	 *
 	 * @inheritDoc
 	 */
-	public function __construct($message = null, $code = null, $iSourceLineNumber = 0, $sXPath = '', $sExtraInfo = '', $previous = null)
+	public function __construct($message = null, $code = 0, $iSourceLineNumber = 0, $sXPath = '', $sExtraInfo = '', $previous = null)
 	{
 		parent::__construct($message, $code, $previous);
 		$this->iSourceLineNumber = $iSourceLineNumber;