diff --git a/langchain/src/chat_models/openai.ts b/langchain/src/chat_models/openai.ts
index cbda733aea9..7e3f72c3e8f 100644
--- a/langchain/src/chat_models/openai.ts
+++ b/langchain/src/chat_models/openai.ts
@@ -449,6 +449,9 @@ export class ChatOpenAI<
       }
 
       const { delta } = choice;
+      if (!delta) {
+        continue;
+      }
       const chunk = _convertDeltaToMessageChunk(delta, defaultRole);
       defaultRole = delta.role ?? defaultRole;
       const newTokenIndices = {