diff --git a/backend/internal/service/openai_codex_transform.go b/backend/internal/service/openai_codex_transform.go
index 9d47c1c56e..c2169ab656 100644
--- a/backend/internal/service/openai_codex_transform.go
+++ b/backend/internal/service/openai_codex_transform.go
@@ -1176,7 +1176,7 @@ func extractLosslessTextFromContent(content any) (string, bool) {
 			if !ok {
 				return "", false
 			}
-			b.WriteString(text)
+			_, _ = b.WriteString(text)
 		}
 		return b.String(), true
 	default: