diff --git a/base/src/org/compiere/model/CalloutPayment.java b/base/src/org/compiere/model/CalloutPayment.java
index e61a0f428c..e1395c07f4 100644
--- a/base/src/org/compiere/model/CalloutPayment.java
+++ b/base/src/org/compiere/model/CalloutPayment.java
@@ -271,7 +271,7 @@ public class CalloutPayment extends CalloutEngine
 			}
 		}
 		//	Order Waiting Payment (can only be SO)
-		if (C_Order_ID != 0 && !dt.isSOTrx())
+		if (C_Order_ID != 0 && dt != null && !dt.isSOTrx())
 			return "PaymentDocTypeInvoiceInconsistent";
 		
 		return "";