diff --git a/sdk/openai/azure-ai-openai/src/samples/java/com/azure/ai/openai/usage/GetChatCompletionsStreamAsyncSample.java b/sdk/openai/azure-ai-openai/src/samples/java/com/azure/ai/openai/usage/GetChatCompletionsStreamAsyncSample.java
index 39e14ce98499..c2a7fd64a1fc 100644
--- a/sdk/openai/azure-ai-openai/src/samples/java/com/azure/ai/openai/usage/GetChatCompletionsStreamAsyncSample.java
+++ b/sdk/openai/azure-ai-openai/src/samples/java/com/azure/ai/openai/usage/GetChatCompletionsStreamAsyncSample.java
@@ -68,7 +68,7 @@ public static void main(String[] args) throws InterruptedException {
                  */
 
                 if (CoreUtils.isNullOrEmpty(chatCompletions.getChoices())) {
-                    return null;
+                    return "";
                 }
 
                 ChatResponseMessage delta = chatCompletions.getChoices().get(0).getDelta();