diff --git a/libs/community/langchain_google_community/bq_storage_vectorstores/bigquery.py b/libs/community/langchain_google_community/bq_storage_vectorstores/bigquery.py
index 00045e15..4fbd8d3a 100644
--- a/libs/community/langchain_google_community/bq_storage_vectorstores/bigquery.py
+++ b/libs/community/langchain_google_community/bq_storage_vectorstores/bigquery.py
@@ -136,6 +136,9 @@ def initialize_bq_vector_index(cls, values: dict) -> dict:
             values["_logger"].debug("Not enough rows to create a vector index.")
             return values
 
+        if "_last_index_check" not in values:
+            values["_last_index_check"] = datetime.min
+
         if datetime.utcnow() - values["_last_index_check"] < INDEX_CHECK_INTERVAL:
             return values