diff --git a/backend/open_webui/apps/rag/main.py b/backend/open_webui/apps/rag/main.py
index 32ca6b7e9..a0d4c7d28 100644
--- a/backend/open_webui/apps/rag/main.py
+++ b/backend/open_webui/apps/rag/main.py
@@ -997,7 +997,7 @@ def store_docs_in_vector_db(
 
     try:
         if overwrite:
-            if collection_name in VECTOR_DB_CLIENT.list_collections():
+            if VECTOR_DB_CLIENT.has_collection(collection_name=collection_name):
                 log.info(f"deleting existing collection {collection_name}")
                 VECTOR_DB_CLIENT.delete_collection(collection_name=collection_name)
 
diff --git a/backend/open_webui/apps/rag/vector/dbs/chroma.py b/backend/open_webui/apps/rag/vector/dbs/chroma.py
index b04dbd6bc..693b41f23 100644
--- a/backend/open_webui/apps/rag/vector/dbs/chroma.py
+++ b/backend/open_webui/apps/rag/vector/dbs/chroma.py
@@ -36,10 +36,10 @@ class ChromaClient:
                 database=CHROMA_DATABASE,
             )
 
-    def list_collections(self) -> list[str]:
-        # List all the collections in the database.
+    def has_collection(self, collection_name: str) -> bool:
+        # Check if the collection exists based on the collection name.
         collections = self.client.list_collections()
-        return [collection.name for collection in collections]
+        return collection_name in [collection.name for collection in collections]
 
     def delete_collection(self, collection_name: str):
         # Delete the collection based on the collection name.
diff --git a/backend/open_webui/apps/rag/vector/dbs/milvus.py b/backend/open_webui/apps/rag/vector/dbs/milvus.py
index f679b4504..260aa687e 100644
--- a/backend/open_webui/apps/rag/vector/dbs/milvus.py
+++ b/backend/open_webui/apps/rag/vector/dbs/milvus.py
@@ -80,13 +80,11 @@ class MilvusClient:
             index_params=index_params,
         )
 
-    def list_collections(self) -> list[str]:
-        # List all the collections in the database.
-        return [
-            collection[len(self.collection_prefix) :]
-            for collection in self.client.list_collections()
-            if collection.startswith(self.collection_prefix)
-        ]
+    def has_collection(self, collection_name: str) -> bool:
+        # Check if the collection exists based on the collection name.
+        return self.client.has_collection(
+            collection_name=f"{self.collection_prefix}_{collection_name}"
+        )
 
     def delete_collection(self, collection_name: str):
         # Delete the collection based on the collection name.