Crash when loading an extension with invalid dithering matrices (?) and the console must be shown

[sentry-io]

Sentry Issue: ASEPRITE-14T

OS Version: Windows 10.0.19045 (2965)
Report Version: 104

Crashed Thread: 23012

Application Specific Information:
Fatal Error: EXCEPTION_ACCESS_VIOLATION_READ / 0x280

Thread 23012 Crashed:
0   aseprite.exe                    0x7ff614f4189e      mtx_do_lock (mutex.cpp:88)
1   aseprite.exe                    0x7ff6148f5f81      [inlined] std::_Mutex_base::lock (mutex:50)
2   aseprite.exe                    0x7ff6148f5f81      [inlined] std::lock_guard<T>::{ctor} (mutex:427)
3   aseprite.exe                    0x7ff6148f5f81      [inlined] obs::safe_list<T>::push_back (safe_list.h:293)
4   aseprite.exe                    0x7ff6148f5f81      obs::signal<T>::add_slot (signal.h:98)
5   aseprite.exe                    0x7ff6148f5394      [inlined] obs::signal<T>::connect (signal.h:104)
6   aseprite.exe                    0x7ff6148f5394      app::Console::ConsoleWindow::ConsoleWindow (console.cpp:49)
7   aseprite.exe                    0x7ff6148f5178      app::Console::Console (console.cpp:225)
8   aseprite.exe                    0x7ff61499980c      app::load_document (file.cpp:219)
9   aseprite.exe                    0x7ff614b0c1b3      app::load_dithering_matrix_from_sprite (load_matrix.cpp:26)
10  aseprite.exe                    0x7ff61490e31b      app::Extension::DitheringMatrixInfo::matrix (extensions.cpp:223)
11  aseprite.exe                    0x7ff614c3b1bd      app::DitheringSelector::regenerate (dithering_selector.cpp:235)
12  aseprite.exe                    0x7ff614c3a3af      app::DitheringSelector::DitheringSelector (dithering_selector.cpp:190)
13  aseprite.exe                    0x7ff614b4c147      app::ContextBar::ContextBar (context_bar.cpp:1762)
14  aseprite.exe                    0x7ff614974e88      app::MainWindow::MainWindow (main_window.cpp:109)
15  aseprite.exe                    0x7ff6148698d7      app::App::initialize (app.cpp:365)
16  aseprite.exe                    0x7ff61486238a      app_main (main.cpp:143)
17  aseprite.exe                    0x7ff614ffe635      wWinMain (main.cpp:40)
18  aseprite.exe                    0x7ff614f72b29      [inlined] invoke_main (exe_common.inl:118)
19  aseprite.exe                    0x7ff614f72b29      __scrt_common_main_seh (exe_common.inl:288)
20  KERNEL32.DLL                    0x7ffabee87613      BaseThreadInitThunk
21  ntdll.dll                       0x7ffac09c26a0      RtlUserThreadStart