diff --git a/api/onnx_web/diffusers/run.py b/api/onnx_web/diffusers/run.py
index c3d0406e..816aa01d 100644
--- a/api/onnx_web/diffusers/run.py
+++ b/api/onnx_web/diffusers/run.py
@@ -91,7 +91,7 @@ def add_thumbnail_output(
             size=Size(server.thumbnail_size, server.thumbnail_size)
         )
 
-        images.insert_image(0, thumbnail, images.metadata[0])
+        images.insert_image(0, thumbnail, metadata)
 
 
 def run_txt2img_pipeline(