diff --git a/web/pdf_page_view.js b/web/pdf_page_view.js
index 8d6771129..ec98a17ce 100644
--- a/web/pdf_page_view.js
+++ b/web/pdf_page_view.js
@@ -618,10 +618,17 @@ class PDFPageView {
         }
         this.eventBus._off("textlayerrendered", this._onTextLayerRendered);
         this._onTextLayerRendered = null;
+
+        if (!this.canvas) {
+          return; // The canvas was removed, prevent errors below.
+        }
         this.pdfPage.getStructTree().then(tree => {
           if (!tree) {
             return;
           }
+          if (!this.canvas) {
+            return; // The canvas was removed, prevent errors below.
+          }
           const treeDom = this.structTreeLayer.render(tree);
           treeDom.classList.add("structTree");
           this.canvas.appendChild(treeDom);