diff --git a/backend/open_webui/routers/retrieval.py b/backend/open_webui/routers/retrieval.py
index 19e8e108db..d2a6857c06 100644
--- a/backend/open_webui/routers/retrieval.py
+++ b/backend/open_webui/routers/retrieval.py
@@ -524,7 +524,7 @@ async def update_embedding_config(request: Request, form_data: EmbeddingModelUpd
         updates = {
             'rag.embedding_engine': form_data.RAG_EMBEDDING_ENGINE,
             'rag.embedding_model': form_data.RAG_EMBEDDING_MODEL.strip(),
-            'rag.embedding_batch_size': form_data.RAG_EMBEDDING_BATCH_SIZE,
+            'rag.embedding_batch_size': form_data.RAG_EMBEDDING_BATCH_SIZE or 1,
             'rag.enable_async_embedding': form_data.ENABLE_ASYNC_EMBEDDING,
             'rag.embedding_concurrent_requests': form_data.RAG_EMBEDDING_CONCURRENT_REQUESTS,
         }