From 111898ee0e3236fb864558f652fbe503442411b4 Mon Sep 17 00:00:00 2001
From: John O'Keefe <git@linuxhg.com>
Date: Sat, 3 Oct 2026 22:30:03 -0400
Subject: [PATCH] fix(paginator): bail from expand() when the iframe document
 is torn down

A queued resize tick can run against a not-yet-parsed or unloaded
iframe; documentElement is null then and expand() threw inside the
ResizeObserver callback. Observed live in the Android app (twice in
row during boot and page turns). Follows the 50f56ee guard family.
---
 package.json | 2 +-
 paginator.js | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 7ab75dd..f3a14b5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "foliate-js",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Render e-books in the browser",
   "repository": {
     "type": "git",
diff --git a/paginator.js b/paginator.js
index 4149be8..fa9dbef 100644
--- a/paginator.js
+++ b/paginator.js
@@ -381,6 +381,10 @@ class View {
         }
     }
     expand() {
+        // A queued resize tick can run against a torn-down or
+        // not-yet-parsed iframe; bail instead of throwing (the caller
+        // re-renders on the next real observation).
+        if (!this.document?.documentElement) return
         const { documentElement } = this.document
         if (this.#column) {
             const side = this.#vertical ? 'height' : 'width'