|  | @@ -3519,8 +3519,14 @@ var PDFViewer = (function pdfViewer() {
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				|  |  |       * @param {number} rotation - The rotation of the pages (0, 90, 180, 270).
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				|  |  |       */
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				|  |  |      set pagesRotation(rotation) {
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				|  |  | +      if (!(typeof rotation === 'number' && rotation % 90 === 0)) {
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				|  |  | +        throw new Error('Invalid pages rotation angle.');
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				|  |  | +      }
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				|  |  |        this._pagesRotation = rotation;
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				|  |  |  
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				|  |  | +      if (!this.pdfDocument) {
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				|  |  | +        return;
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				|  |  | +      }
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				|  |  |        for (var i = 0, l = this._pages.length; i < l; i++) {
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				|  |  |          var pageView = this._pages[i];
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				|  |  |          pageView.update(pageView.scale, rotation);
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