diff --git a/backend/open_webui/utils/middleware.py b/backend/open_webui/utils/middleware.py
index 9dbbc280eb..a13f43193d 100644
--- a/backend/open_webui/utils/middleware.py
+++ b/backend/open_webui/utils/middleware.py
@@ -775,7 +775,8 @@ def handle_responses_streaming_event(
         response_data = data.get('response', {})
         final_output = response_data.get('output')
 
-        new_output = final_output if final_output is not None else current_output
+        # Some providers send an empty output on response.completed despite having streamed items
+        new_output = final_output if final_output else current_output
 
         # Ensure reasoning items are marked as completed in the final output
         if new_output: