Index: includes/specials/SpecialProtectedpages.php
===================================================================
--- includes/specials/SpecialProtectedpages.php	(revision 48334)
+++ includes/specials/SpecialProtectedpages.php	(working copy)
@@ -282,7 +282,7 @@
 
 	function getQueryInfo() {
 		$conds = $this->mConds;
-		$conds[] = 'pr_expiry>' . $this->mDb->addQuotes( $this->mDb->timestamp() );
+		$conds[] = '(pr_expiry>' . $this->mDb->addQuotes( $this->mDb->timestamp() ) . 'OR pr_expiry IS NULL)';
 		$conds[] = 'page_id=pr_page';
 		$conds[] = 'pr_type=' . $this->mDb->addQuotes( $this->type );