diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 19570e8..a3e3ae6 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -420,7 +420,7 @@ function theme_escape_and_render($arg) {
   // simple cases already handled.
 
   // Early return if this element was pre-rendered (no need to re-render).
-  if (!empty($arg['#printed']) && isset($arg['#markup']) && strlen($arg['#markup']) > 0) {
+  if (isset($arg['#printed']) && $arg['#printed'] == TRUE && isset($arg['#markup']) && strlen($arg['#markup']) > 0) {
     return (string) $arg['#markup'];
   }
   $arg['#printed'] = FALSE;