diff --git a/backend/internal/service/openai_images_responses.go b/backend/internal/service/openai_images_responses.go
index 102e504ca8..c98e8008c1 100644
--- a/backend/internal/service/openai_images_responses.go
+++ b/backend/internal/service/openai_images_responses.go
@@ -629,7 +629,7 @@ func summarizeOpenAIImagesNoOutputBody(body []byte) string {
 		}
 	})
 	var b strings.Builder
-	b.WriteString("no_image_output")
+	_, _ = b.WriteString("no_image_output")
 	if lastType != "" {
 		fmt.Fprintf(&b, " last_event=%s", lastType)
 	}