Fix preview

diff --git a/includes/EditPage.php b/includes/EditPage.php
index 67408cc..d8a0d19 100644 (file)
--- a/includes/EditPage.php
+++ b/includes/EditPage.php
@@ -495,7 +495,9 @@ class EditPage {
                                $this->mArticle->setOldSubtitle();
                                $wgOut->addWikiText( wfMsg( 'nonunicodebrowser') );
                        }
-                       if ( !$this->mArticle->mRevision->isCurrent() ) {
+                       if ( isset( $this->mArticle )
+                            && isset( $this->mArticle->mRevision
+                            && !$this->mArticle->mRevision->isCurrent() ) {
                                $this->mArticle->setOldSubtitle();
                                $wgOut->addWikiText( wfMsg( 'editingold' ) );
                        }