fix: try to avoid crash on image load when app is exiting (#6018)

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Bugfix: Fixed a potential way to escape the Lua Plugin sandbox. (#5846)
 - Bugfix: Fixed a crash relating to Lua HTTP. (#5800)
 - Bugfix: Fixed a crash that could occur on Linux and macOS when clicking "Install" from the update prompt. (#5818)
+- Bugfix: Fixed a crash related to image loading that could occur when closing Chatterino. (#6018)
 - Bugfix: Fixed missing word wrap in update popup. (#5811)
 - Bugfix: Fixed tabs not scaling to the default scale when changing the scale from a non-default value. (#5794)
 - Bugfix: Closing a usercard will no longer cause stop-logging messages to be generated in channel logs. (#5828)

mocks/include/mocks/Helix.hpp

@@ -7,6 +7,7 @@
 #include <QString>
 #include <QStringList>
 
+#include <functional>
 #include <vector>
 
 namespace chatterino::mock {

src/messages/Image.cpp

@@ -245,7 +245,11 @@ void assignFrames(std::weak_ptr<Image> weak, QList<Frame> parsed)
             isPushQueued = true;
             postToThread([] {
                 isPushQueued = false;
-                getApp()->getWindows()->forceLayoutChannelViews();
+                auto *app = tryGetApp();
+                if (app != nullptr)
+                {
+                    app->getWindows()->forceLayoutChannelViews();
+                }
             });
         }
     };