diff --git a/library/src/main/java/org/mustangproject/Item.java b/library/src/main/java/org/mustangproject/Item.java
index 8fefa87f..c73a7b7f 100644
--- a/library/src/main/java/org/mustangproject/Item.java
+++ b/library/src/main/java/org/mustangproject/Item.java
@@ -187,8 +187,12 @@ public class Item implements IZUGFeRDExportableItem {
 					if (amountString!=null) {
 						izac.setTotalAmount(new BigDecimal(amountString));
 					}
-					izac.setPercent(new BigDecimal(percentString));
-					izac.setReason(reason);
+					if(percentString!=null) {
+						izac.setPercent(new BigDecimal(percentString));
+					}
+					if(reason!=null) {
+						izac.setReason(reason);
+					}
 
 					if (isChargeString.equalsIgnoreCase("false")) {
 						addAllowance(izac);