diff --git a/core/src/main/java/com/google/adk/flows/llmflows/ResponseProcessor.java b/core/src/main/java/com/google/adk/flows/llmflows/ResponseProcessor.java
index d8e5ce3ab..bd82945d2 100644
--- a/core/src/main/java/com/google/adk/flows/llmflows/ResponseProcessor.java
+++ b/core/src/main/java/com/google/adk/flows/llmflows/ResponseProcessor.java
@@ -53,7 +53,7 @@ public abstract static class ResponseProcessingResult {
     public static ResponseProcessingResult create(
         LlmResponse updatedResponse, Iterable<Event> events, String transferToAgent) {
       return new AutoValue_ResponseProcessor_ResponseProcessingResult(
-          updatedResponse, events, Optional.of(transferToAgent));
+          updatedResponse, events, Optional.ofNullable(transferToAgent));
     }
 
     public static ResponseProcessingResult create(