diff --git a/src/logging/logger.ts b/src/logging/logger.ts
index ccd3de3c5b5..bf26b748eae 100644
--- a/src/logging/logger.ts
+++ b/src/logging/logger.ts
@@ -269,7 +269,7 @@ function stringifyFileLogMessagePart(value: unknown): string | undefined {
   try {
     return JSON.stringify(value);
   } catch {
-    return String(value);
+    return undefined;
   }
 }