diff --git a/src/error/PhutilAggregateException.php b/src/error/PhutilAggregateException.php
--- a/src/error/PhutilAggregateException.php
+++ b/src/error/PhutilAggregateException.php
@@ -39,7 +39,7 @@
       $ex_message =
         (is_string($key) ? $key.': ' : '').
         get_class($exception).': '.
-        $exception->getMessage();
+        $exception;
       $ex_message = '    - '.str_replace("\n", "\n      ", $ex_message);
 
       $full_message[] = $ex_message;