diff --git a/spring-webflow-samples/booking-faces/src/main/java/org/springframework/webflow/samples/booking/Booking.java b/spring-webflow-samples/booking-faces/src/main/java/org/springframework/webflow/samples/booking/Booking.java
index 63dc61a4..69d5674b 100755
--- a/spring-webflow-samples/booking-faces/src/main/java/org/springframework/webflow/samples/booking/Booking.java
+++ b/spring-webflow-samples/booking-faces/src/main/java/org/springframework/webflow/samples/booking/Booking.java
@@ -68,7 +68,11 @@ public class Booking implements Serializable {
 
     @Transient
     public int getNights() {
-	return (int) (checkoutDate.getTime() - checkinDate.getTime()) / 1000 / 60 / 60 / 24;
+	if (checkinDate == null || checkoutDate == null) {
+	    return 0;
+	} else {
+	    return (int) (checkoutDate.getTime() - checkinDate.getTime()) / 1000 / 60 / 60 / 24;
+	}
     }
 
     @Id