diff --git a/src/core/document.js b/src/core/document.js
index 434cbac2a6325..25952d0016979 100644
--- a/src/core/document.js
+++ b/src/core/document.js
@@ -707,7 +707,7 @@ class Page {
     const structTree = await this.pdfManager.ensure(this, "_parseStructTree", [
       structTreeRoot,
     ]);
-    return structTree.serializable;
+    return this.pdfManager.ensure(structTree, "serializable");
   }
 
   /**
diff --git a/web/struct_tree_layer_builder.js b/web/struct_tree_layer_builder.js
index ead85bbf12507..72ba6bc5c111c 100644
--- a/web/struct_tree_layer_builder.js
+++ b/web/struct_tree_layer_builder.js
@@ -112,8 +112,14 @@ class StructTreeLayerBuilder {
   }
 
   async getAriaAttributes(annotationId) {
-    await this.render();
-    return this.#elementAttributes.get(annotationId);
+    try {
+      await this.render();
+      return this.#elementAttributes.get(annotationId);
+    } catch {
+      // If the structTree cannot be fetched, parsed, and/or rendered,
+      // ensure that e.g. the AnnotationLayer won't break completely.
+    }
+    return null;
   }
 
   hide() {