diff --git a/web/app.js b/web/app.js
index 575c98523..082335725 100644
--- a/web/app.js
+++ b/web/app.js
@@ -136,6 +136,7 @@ var PDFViewerApplication = {
   l10n: null,
   pageRotation: 0,
   isInitialViewSet: false,
+  downloadComplete: false,
   viewerPrefs: {
     sidebarViewOnLoad: SidebarView.NONE,
     pdfBugEnabled: false,
@@ -600,7 +601,9 @@ var PDFViewerApplication = {
       this.pdfDocumentProperties.setDocument(null, null);
     }
     this.store = null;
+    this.pageRotation = 0;
     this.isInitialViewSet = false;
+    this.downloadComplete = false;
 
     this.pdfSidebar.reset();
     this.pdfOutlineViewer.reset();
@@ -670,8 +673,6 @@ var PDFViewerApplication = {
       }
     }
 
-    this.downloadComplete = false;
-
     let loadingTask = getDocument(parameters);
     this.pdfLoadingTask = loadingTask;
 
@@ -912,8 +913,6 @@ var PDFViewerApplication = {
     let pagesPromise = pdfViewer.pagesPromise;
     let onePageRendered = pdfViewer.onePageRendered;
 
-    this.pageRotation = 0;
-
     let pdfThumbnailViewer = this.pdfThumbnailViewer;
     pdfThumbnailViewer.setDocument(pdfDocument);
 
@@ -1242,8 +1241,11 @@ var PDFViewerApplication = {
     this.forceRendering();
   },
 
-  rotatePages: function pdfViewRotatePages(delta) {
-    var pageNumber = this.page;
+  rotatePages(delta) {
+    if (!this.pdfDocument) {
+      return;
+    }
+    let pageNumber = this.page;
     this.pageRotation = (this.pageRotation + 360 + delta) % 360;
     this.pdfViewer.pagesRotation = this.pageRotation;
     this.pdfThumbnailViewer.pagesRotation = this.pageRotation;