From e8764d322cebeacfd23b01b9542112c3d072d654 Mon Sep 17 00:00:00 2001
From: Xiao YiFang <yifang.xiao@foxmail.com>
Date: Mon, 3 Oct 2022 10:35:47 +0800
Subject: [PATCH] fix: access violation

---
 scanpopup.cc | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/scanpopup.cc b/scanpopup.cc
index dacce48e..26197c54 100644
--- a/scanpopup.cc
+++ b/scanpopup.cc
@@ -1136,11 +1136,15 @@ void ScanPopup::altModePoll()
 
 void ScanPopup::pageLoaded( ArticleView * )
 {
-
-
-  definition->hasSound([this](bool has){
-      ui.pronounceButton->setVisible( has );
-  });
+  if( !isVisible() )
+    return;
+  auto pronounceBtn = ui.pronounceButton;
+  definition->hasSound(
+    [ pronounceBtn ]( bool has )
+    {
+      if( pronounceBtn )
+        pronounceBtn->setVisible( has );
+    } );
 
   updateBackForwardButtons();