From eebd143a9ff277ac9536c7c51e3fee5490ccfc72 Mon Sep 17 00:00:00 2001
From: Austin S <17107540+Aquafina-water-bottle@users.noreply.github.com>
Date: Wed, 17 May 2023 00:52:38 -0600
Subject: [PATCH] Fix null error on window resizing (#2501)

* Fix null error on window resizing

* Be more specific in type cast (dae)
---
 CONTRIBUTORS                   | 1 +
 ts/reviewer/image_occlusion.ts | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 555a229ae..885cf9d8f 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -120,6 +120,7 @@ Ben Kerman <ben@kermanic.org>
 Euan Kemp <euank@euank.com>
 Kieran Black <kieranlblack@gmail.com>
 XeR <github.com/XeR>
+Austin Siew <github.com/Aquafina-water-bottle>
 
 ********************
 
diff --git a/ts/reviewer/image_occlusion.ts b/ts/reviewer/image_occlusion.ts
index b0a83034b..319e27221 100644
--- a/ts/reviewer/image_occlusion.ts
+++ b/ts/reviewer/image_occlusion.ts
@@ -12,7 +12,11 @@ export function setupImageCloze(): void {
 }
 
 function setupImageClozeInner(): void {
-    const canvas: HTMLCanvasElement = document.querySelector("canvas")! as HTMLCanvasElement;
+    const canvas = document.querySelector("canvas") as HTMLCanvasElement | null;
+    if (canvas == null) {
+        return;
+    }
+
     canvas.style.maxWidth = "100%";
     canvas.style.maxHeight = "95vh";