try
{
    $templateStats = $legacyKernel()->runCallback(
        function ()
        {
            return eZTemplate::templatesUsageStatistics();
        }
    );
}
catch ( RuntimeException $e )
{
    // Ignore the exception thrown by legacy kernel as this would break debug toolbar (and thus debug info display).
    // Furthermore, some legacy kernel handlers don't support runCallback (e.g. ezpKernelTreeMenu)
}

foreach ( $templateStats as $tplInfo )
{
    // ...
}

catch ( RuntimeException $e )
{
    // Ignore the exception thrown by legacy kernel as this would break debug toolbar (and thus debug info display).
    // Furthermore, some legacy kernel handlers don't support runCallback (e.g. ezpKernelTreeMenu)
    $templateStats = array();
}