diff --git a/spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java b/spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java
index e4a9b326..26aae80c 100644
--- a/spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java
+++ b/spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java
@@ -116,7 +116,11 @@ public class Transition extends AnnotatedObject implements TransitionDefinition
 	}
 
 	public String getTargetStateId() {
-		return targetStateResolver.toString();
+		if (targetStateResolver != null) {
+			return targetStateResolver.toString();
+		} else {
+			return null;
+		}
 	}
 
 	/**