From 049d2b2420234d6ce21e441543ae559781c6574e Mon Sep 17 00:00:00 2001
From: Yongsheng Xu <chuxdesign@hotmail.com>
Date: Wed, 5 Nov 2025 13:31:56 +0800
Subject: [PATCH] fix(mlc): ignore non-text chat deltas before streaming

---
 packages/mlc/src/ai-sdk.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/mlc/src/ai-sdk.ts b/packages/mlc/src/ai-sdk.ts
index 417b8347..d037e952 100644
--- a/packages/mlc/src/ai-sdk.ts
+++ b/packages/mlc/src/ai-sdk.ts
@@ -221,6 +221,9 @@ class MlcChatLanguageModel implements LanguageModelV2 {
 
           const updateListener = NativeMLCEngine.onChatUpdate((data) => {
             if (data.delta) {
+              if (typeof data.delta?.content !== 'string') {
+                return
+              }
               controller.enqueue({
                 type: 'text-delta',
                 delta: data.delta.content,