From e41df688980266bd2a30d334606a31816b807b22 Mon Sep 17 00:00:00 2001
From: Ming Ming <nkming2@gmail.com>
Date: Wed, 15 Sep 2021 05:03:09 +0800
Subject: [PATCH] Fix a rare NPE

---
 lib/widget/viewer.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/widget/viewer.dart b/lib/widget/viewer.dart
index 10e71489..09dcd11e 100644
--- a/lib/widget/viewer.dart
+++ b/lib/widget/viewer.dart
@@ -108,7 +108,7 @@ class _ViewerState extends State<Viewer>
         children: [
           Container(color: Colors.black),
           if (!_isViewerLoaded ||
-              !_pageStates[_viewerController.currentPage]!.hasLoaded)
+              _pageStates[_viewerController.currentPage]?.hasLoaded != true)
             Align(
               alignment: Alignment.center,
               child: const CircularProgressIndicator(),