diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index 6a888464..51f58b4e 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -1673,7 +1673,7 @@ SQL_TEMPLATES = {
                      """,
     "upsert_entity": """INSERT INTO LIGHTRAG_VDB_ENTITY (workspace, id, entity_name, content,
                       content_vector, chunk_ids, file_path)
-                      VALUES ($1, $2, $3, $4, $5, $6::varchar[], $7::varchar[])
+                      VALUES ($1, $2, $3, $4, $5, $6::varchar[], $7)
                       ON CONFLICT (workspace,id) DO UPDATE
                       SET entity_name=EXCLUDED.entity_name,
                       content=EXCLUDED.content,
@@ -1684,7 +1684,7 @@ SQL_TEMPLATES = {
                      """,
     "upsert_relationship": """INSERT INTO LIGHTRAG_VDB_RELATION (workspace, id, source_id,
                       target_id, content, content_vector, chunk_ids, file_path)
-                      VALUES ($1, $2, $3, $4, $5, $6, $7::varchar[], $8::varchar[])
+                      VALUES ($1, $2, $3, $4, $5, $6, $7::varchar[], $8)
                       ON CONFLICT (workspace,id) DO UPDATE
                       SET source_id=EXCLUDED.source_id,
                       target_id=EXCLUDED.target_id,