From 2a1d53f0b02995949322706e878c324f1fc93ad1 Mon Sep 17 00:00:00 2001
From: Veloman Yunkan <veloman.yunkan@gmail.com>
Date: Sun, 30 Jun 2024 13:14:22 +0400
Subject: [PATCH] Safer ContentManager::downloadDisappeared()

---
 src/contentmanager.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/contentmanager.cpp b/src/contentmanager.cpp
index 5e8e970..4d47b56 100644
--- a/src/contentmanager.cpp
+++ b/src/contentmanager.cpp
@@ -467,7 +467,15 @@ void ContentManager::removeDownload(QString bookId)
 void ContentManager::downloadDisappeared(QString bookId)
 {
     removeDownload(bookId);
-    kiwix::Book bCopy(mp_library->getBookById(bookId));
+    kiwix::Book bCopy;
+    try {
+        bCopy = mp_library->getBookById(bookId);
+    } catch ( const std::out_of_range& ) {
+        // If the download has disappeared as a result of some
+        // obscure chain of events, the book may have disappeared too.
+        return;
+    }
+
     bCopy.setDownloadId("");
     mp_library->getKiwixLibrary()->addOrUpdateBook(bCopy);
     mp_library->save();