diff --git a/web/app.js b/web/app.js
index 27dc2935f..7bc296bd4 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1383,14 +1383,23 @@ const PDFViewerApplication = {
 
     onePageRendered.then(() => {
       pdfDocument.getOutline().then(outline => {
+        if (pdfDocument !== this.pdfDocument) {
+          return; // The document was closed while the outline resolved.
+        }
         this.pdfOutlineViewer.render({ outline, pdfDocument });
       });
       pdfDocument.getAttachments().then(attachments => {
+        if (pdfDocument !== this.pdfDocument) {
+          return; // The document was closed while the attachments resolved.
+        }
         this.pdfAttachmentViewer.render({ attachments });
       });
       // Ensure that the layers accurately reflects the current state in the
       // viewer itself, rather than the default state provided by the API.
       pdfViewer.optionalContentConfigPromise.then(optionalContentConfig => {
+        if (pdfDocument !== this.pdfDocument) {
+          return; // The document was closed while the layers resolved.
+        }
         this.pdfLayerViewer.render({ optionalContentConfig, pdfDocument });
       });
       if (