Internal: Add error note explaining we ignore serialization failures

main/inc/lib/database.lib.php

@@ -394,10 +394,11 @@ class Database
             exit;
         } else {
             $msg = $e->getMessage();
-            error_log($msg);
             if (preg_match('/Serialization failure:/', $msg)) {
                 //do nothing except from logging
+                error_log($msg.' - Reported but otherwise ignored');
             } else {
+                error_log($msg);
                 api_not_allowed(false, get_lang('GeneralError'));
                 exit;
             }