diff --git a/app/code/community/Wirecard/CheckoutPage/Helper/Data.php b/app/code/community/Wirecard/CheckoutPage/Helper/Data.php
index 2d9afba..5cc328b 100644
--- a/app/code/community/Wirecard/CheckoutPage/Helper/Data.php
+++ b/app/code/community/Wirecard/CheckoutPage/Helper/Data.php
@@ -33,7 +33,7 @@
 class Wirecard_CheckoutPage_Helper_Data extends Mage_Payment_Helper_Data
 {
 
-    protected $_pluginVersion = '4.2.4';
+    protected $_pluginVersion = '4.2.5';
     protected $_pluginName = 'Wirecard/CheckoutPage';
 
     /**
diff --git a/app/code/community/Wirecard/CheckoutPage/Model/Abstract.php b/app/code/community/Wirecard/CheckoutPage/Model/Abstract.php
index 9a3098f..549dfb6 100644
--- a/app/code/community/Wirecard/CheckoutPage/Model/Abstract.php
+++ b/app/code/community/Wirecard/CheckoutPage/Model/Abstract.php
@@ -52,7 +52,7 @@ abstract class Wirecard_CheckoutPage_Model_Abstract extends Mage_Payment_Model_M
 	protected $_defaultLocale = 'en';
 
 	protected $_order;
-	protected $_pluginVersion = '4.2.4';
+	protected $_pluginVersion = '4.2.5';
 	protected $_pluginName = 'Wirecard/CheckoutPage';
 
 	protected $_formBlockType = 'wirecard_checkoutpage/form';
@@ -192,7 +192,11 @@ public function initPayment() {
 			$bitem->setUnitGrossAmount( number_format( $order->getShippingInclTax(), $precision, '.', '' ) );
 			$bitem->setUnitNetAmount( number_format( $order->getShippingAmount(), $precision, '.', '' ) );
 			$bitem->setUnitTaxAmount( number_format( $order->getShippingTaxAmount(), $precision, '.', '' ) );
-			$bitem->setUnitTaxRate( ( ( $bitem->getUnitGrossAmount() / $bitem->getUnitNetAmount() ) - 1 ) * 100 );
+            if ( $bitem->getUnitNetAmount() > 0 ) {
+                $bitem->setUnitTaxRate( ( ( $bitem->getUnitGrossAmount() / $bitem->getUnitNetAmount() ) - 1 ) * 100 );
+            } else {
+                $bitem->setUnitTaxRate( 0 );
+            }
 			$bitem->setDescription( $order->getShippingDescription() );
 			$bitem->setName( 'shipping' );
 			$basket->addItem( $bitem );
diff --git a/app/code/community/Wirecard/CheckoutPage/etc/config.xml b/app/code/community/Wirecard/CheckoutPage/etc/config.xml
index 6d1c214..6704a13 100644
--- a/app/code/community/Wirecard/CheckoutPage/etc/config.xml
+++ b/app/code/community/Wirecard/CheckoutPage/etc/config.xml
@@ -34,7 +34,7 @@
 <config>
     <modules>
         <Wirecard_CheckoutPage>
-            <version>4.2.4</version>
+            <version>4.2.5</version>
         </Wirecard_CheckoutPage>
     </modules>
     <global>