diff --git a/bower.json b/bower.json
index b2995164a..51d108a73 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.5.370",
+  "version": "1.5.372",
   "main": [
     "build/pdf.js",
     "build/pdf.worker.js"
diff --git a/build/pdf.combined.js b/build/pdf.combined.js
index d484d97fc..59d60df80 100644
--- a/build/pdf.combined.js
+++ b/build/pdf.combined.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdfCombined = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.5.370';
-var pdfjsBuild = '3a1e794';
+var pdfjsVersion = '1.5.372';
+var pdfjsBuild = 'ac7b675';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
diff --git a/build/pdf.js b/build/pdf.js
index 780a78b94..c0b0b97c2 100644
--- a/build/pdf.js
+++ b/build/pdf.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdf = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.5.370';
-var pdfjsBuild = '3a1e794';
+var pdfjsVersion = '1.5.372';
+var pdfjsBuild = 'ac7b675';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
diff --git a/build/pdf.worker.js b/build/pdf.worker.js
index a8a06a5e6..bb0f19554 100644
--- a/build/pdf.worker.js
+++ b/build/pdf.worker.js
@@ -28,8 +28,8 @@ factory((root.pdfjsDistBuildPdfWorker = {}));
   // Use strict in our context only - users might not want it
   'use strict';
 
-var pdfjsVersion = '1.5.370';
-var pdfjsBuild = '3a1e794';
+var pdfjsVersion = '1.5.372';
+var pdfjsBuild = 'ac7b675';
 
   var pdfjsFilePath =
     typeof document !== 'undefined' && document.currentScript ?
diff --git a/package.json b/package.json
index c20fcbf60..cfb47c4bd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.5.370",
+  "version": "1.5.372",
   "main": "build/pdf.js",
   "description": "Generic build of Mozilla's PDF.js library.",
   "keywords": [
diff --git a/web/pdf_viewer.js b/web/pdf_viewer.js
index 2fe834b47..098eb27fa 100644
--- a/web/pdf_viewer.js
+++ b/web/pdf_viewer.js
@@ -3519,8 +3519,14 @@ var PDFViewer = (function pdfViewer() {
      * @param {number} rotation - The rotation of the pages (0, 90, 180, 270).
      */
     set pagesRotation(rotation) {
+      if (!(typeof rotation === 'number' && rotation % 90 === 0)) {
+        throw new Error('Invalid pages rotation angle.');
+      }
       this._pagesRotation = rotation;
 
+      if (!this.pdfDocument) {
+        return;
+      }
       for (var i = 0, l = this._pages.length; i < l; i++) {
         var pageView = this._pages[i];
         pageView.update(pageView.scale, rotation);