diff --git a/admin/code/LeftAndMain.php b/admin/code/LeftAndMain.php
index ee9fed2a555..0e488c48f21 100644
--- a/admin/code/LeftAndMain.php
+++ b/admin/code/LeftAndMain.php
@@ -1170,7 +1170,7 @@ function getSilverStripeNavigator() {
 	 * @return int 
 	 */
 	public function currentPageID() {
-		if($this->request->requestVar('ID'))	{
+		if($this->request->requestVar('ID') && is_numeric($this->request->requestVar('ID')))	{
 			return $this->request->requestVar('ID');
 		} elseif (isset($this->urlParams['ID']) && is_numeric($this->urlParams['ID'])) {
 			return $this->urlParams['ID'];