diff --git a/themes/bootstrap3/templates/error/index.phtml b/themes/bootstrap3/templates/error/index.phtml
index a7f10d51c12cdf4fa58548fbd4ec155fe0b0247a..19a86243a3f2dcd8fd961a4b69acff19a3f948b7 100644
--- a/themes/bootstrap3/templates/error/index.phtml
+++ b/themes/bootstrap3/templates/error/index.phtml
@@ -25,7 +25,7 @@
 <? if (isset($this->display_exceptions) && $this->display_exceptions): ?>
   <h2><?=$this->transEsc('Exception')?>:</h2>
   <p>
-    <b><?=$this->transEsc('Message')?>:</b> <?=$this->exception->getMessage()?>
+    <b><?=$this->transEsc('Message')?>:</b> <?=$this->escapeHtml($this->exception->getMessage())?>
   </p>
 
   <h2><?=$this->transEsc('Backtrace')?>:</h2>