diff --git a/core/lib/Drupal/Core/Database/DatabaseExceptionWrapper.php b/core/lib/Drupal/Core/Database/DatabaseExceptionWrapper.php
index b212478..51c4def 100644
--- a/core/lib/Drupal/Core/Database/DatabaseExceptionWrapper.php
+++ b/core/lib/Drupal/Core/Database/DatabaseExceptionWrapper.php
@@ -16,4 +16,8 @@
  */
 class DatabaseExceptionWrapper extends RuntimeException implements DatabaseException {
 
+  function __construct($message = '', $code = 0, $previous = NULL) {
+    echo "<pre>"; var_dump($previous); echo "</pre>\n";
+    parent::__construct($message, $code, $previous);
+  }
 }