From f3fcdea5747106f6f4752630d16afbcca752caff Mon Sep 17 00:00:00 2001
From: Leonid Kuligin <lkuligin@yandex.ru>
Date: Mon, 20 Nov 2023 18:41:14 +0100
Subject: [PATCH] fixed an UnboundLocalError when no documents are found
 (#12995)

Replace this entire comment with:
  - **Description:** fixed a bug
  - **Issue:** the issue # #12780
---
 libs/langchain/langchain/retrievers/google_vertex_ai_search.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libs/langchain/langchain/retrievers/google_vertex_ai_search.py b/libs/langchain/langchain/retrievers/google_vertex_ai_search.py
index 8dc8cd6d8b9..0e0c165c53e 100644
--- a/libs/langchain/langchain/retrievers/google_vertex_ai_search.py
+++ b/libs/langchain/langchain/retrievers/google_vertex_ai_search.py
@@ -160,6 +160,7 @@ class _BaseGoogleVertexAISearchRetriever(BaseModel):
         from google.protobuf.json_format import MessageToDict
 
         documents: List[Document] = []
+        chunk_type = "extractive_answers"
 
         for result in results:
             document_dict = MessageToDict(