diff --git a/web/mozPrintCallback_polyfill.js b/web/mozPrintCallback_polyfill.js
index a9416c1433819..8127a8e8ab59d 100644
--- a/web/mozPrintCallback_polyfill.js
+++ b/web/mozPrintCallback_polyfill.js
@@ -82,7 +82,7 @@
 
   function renderProgress() {
     var progressContainer = document.getElementById('mozPrintCallback-shim');
-    if (canvases) {
+    if (canvases && canvases.length) {
       var progress = Math.round(100 * index / canvases.length);
       var progressBar = progressContainer.querySelector('progress');
       var progressPerc = progressContainer.querySelector('.relative-progress');
diff --git a/web/viewer.js b/web/viewer.js
index 0b473c0ebc1e8..36178a782f4e4 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -1101,7 +1101,7 @@ var PDFViewerApplication = {
 
     var alertNotReady = false;
     var i, ii;
-    if (!this.pagesCount) {
+    if (!this.pdfDocument || !this.pagesCount) {
       alertNotReady = true;
     } else {
       for (i = 0, ii = this.pagesCount; i < ii; ++i) {