Improved BagOStuff docs.

[lhc/web/wiklou.git] / includes / diff / DifferenceEngine.php

diff --git a/includes/diff/DifferenceEngine.php b/includes/diff/DifferenceEngine.php
index 6fcf0e8..97553e6 100644 (file)
--- a/includes/diff/DifferenceEngine.php
+++ b/includes/diff/DifferenceEngine.php
@@ -294,8 +294,11 @@ class DifferenceEngine extends ContextSource {
 
                        if ( $samePage && $this->mNewPage->quickUserCan( 'edit', $user ) ) {
                                if ( $this->mNewRev->isCurrent() && $this->mNewPage->userCan( 'rollback', $user ) ) {
-                                       $out->preventClickjacking();
-                                       $rollback = '   ' . Linker::generateRollback( $this->mNewRev, $this->getContext() );
+                                       $rollbackLink = Linker::generateRollback( $this->mNewRev, $this->getContext() );
+                                       if ( $rollbackLink ) {
+                                               $out->preventClickjacking();
+                                               $rollback = '   ' . $rollbackLink;
+                                       }
                                }
                                if ( !$this->mOldRev->isDeleted( Revision::DELETED_TEXT ) && !$this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
                                        $undoLink = ' ' . $this->msg( 'parentheses' )->rawParams(