diff --git a/module-base/src/main/java/de/intranda/goobi/plugins/ZbzCalculation.java b/module-base/src/main/java/de/intranda/goobi/plugins/ZbzCalculation.java
index 63bfb54..3448c40 100644
--- a/module-base/src/main/java/de/intranda/goobi/plugins/ZbzCalculation.java
+++ b/module-base/src/main/java/de/intranda/goobi/plugins/ZbzCalculation.java
@@ -102,6 +102,11 @@ public void readInvoiceProperties() {
             }
         }
 
+        // if the number of pages is still 0 try to count these
+        if (invoicePages_units == 0) {
+            invoicePages_units = process.getSortHelperImages();
+        }
+
         invoicePages_total = invoicePages_units * invoicePages_price;
         invoiceService_total = invoiceService_units * invoiceService_price;
         invoiceAdditionals_total = invoiceAdditionals_units * invoiceAdditionals_price;
diff --git a/module-base/src/main/java/de/intranda/goobi/plugins/ZbzOrderDeliveryStepPlugin.java b/module-base/src/main/java/de/intranda/goobi/plugins/ZbzOrderDeliveryStepPlugin.java
index 64c3eed..3fbc9bf 100644
--- a/module-base/src/main/java/de/intranda/goobi/plugins/ZbzOrderDeliveryStepPlugin.java
+++ b/module-base/src/main/java/de/intranda/goobi/plugins/ZbzOrderDeliveryStepPlugin.java
@@ -311,7 +311,7 @@ private Document createXmlDocumentOfContent(Fileformat ff) throws PreferencesExc
 
         // generally add the number of images for the process
         Element e4 = new Element("processFiles");
-        e4.setText(String.valueOf(String.valueOf(p.getSortHelperImages())));
+        e4.setText(String.valueOf(p.getSortHelperImages()));
         mainElement.addContent(e4);
 
         // add all properties