@GetMapping("/ai/generateStream")
    fun generateStream(
        @RequestParam(
            value = "message",
            defaultValue = "Tell me a joke"
        ) message: String?
    ): Flux<ChatResponse> {
        val prompt = Prompt(UserMessage(message))
        return chatModel.stream(prompt)
    }

There was an unexpected error (type=Internal Server Error, status=500).
Cannot invoke "com.azure.ai.openai.models.ChatResponseMessage.getToolCalls()" because the return value of "com.azure.ai.openai.models.ChatChoice.getDelta()" is null
java.lang.NullPointerException: Cannot invoke "com.azure.ai.openai.models.ChatResponseMessage.getToolCalls()" because the return value of "com.azure.ai.openai.models.ChatChoice.getDelta()" is null
	at org.springframework.ai.azure.openai.AzureOpenAiChatModel.lambda$internalStream$4(AzureOpenAiChatModel.java:297)
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:113)
	at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onNext(FluxFilterFuseable.java:118)
	at reactor.core.publisher.FluxReplay$UnboundedReplayBuffer.replayNormal(FluxReplay.java:618)
	at reactor.core.publisher.FluxReplay$UnboundedReplayBuffer.replay(FluxReplay.java:709)
	at reactor.core.publisher.FluxReplay$ReplaySubscriber.onNext(FluxReplay.java:1345)
	at reactor.core.publisher.FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber.innerNext(FluxConcatMapNoPrefetch.java:259)
	at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:865)
	at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:335)
	at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:294)
	at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2367)
	at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:2241)
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:201)
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:83)
	at reactor.core.publisher.Flux.subscribe(Flux.java:8891)
	at reactor.core.publisher.FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber.onNext(FluxConcatMapNoPrefetch.java:207)
	at reactor.core.publisher.FluxPublishOn$PublishOnSubscriber.runAsync(FluxPublishOn.java:446)
	at reactor.core.publisher.FluxPublishOn$PublishOnSubscriber.run(FluxPublishOn.java:533)
	at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:84)
	at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:37)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)