I don't know how to reproduce this, but I had auto-collect enabled and clicked on the ace of spades in order to move it to its foundation pile.

1886.249 Solitaire(54:54): VERIFICATION FAILED: m_ptr at ././AK/RefPtr.h:280

1888.132 CrashReporter(57:58): 0x00000000b0d32b18: [/usr/lib/libc.so] ak_verification_failed +0x58 (Assertions.cpp:108 => Assertions.cpp:101)
1888.132 CrashReporter(57:58): 0x00000013b5e02df3: [/bin/Solitaire] Solitaire::Game::mouseup_event(GUI::MouseEvent&) +0x4f3 (RefPtr.h:280 => RefPtr.h:249 => Game.cpp:310)
1888.132 CrashReporter(57:58): 0x0000000d8f0419a4: [/usr/lib/libcore.so.serenity] Core::EventReceiver::dispatch_event(Core::Event&, Core::EventReceiver*) +0x54 (EventReceiver.cpp:163)
1888.132 CrashReporter(57:58): 0x000000036185a05b: [/usr/lib/libgui.so.serenity] GUI::Window::handle_mouse_event(GUI::MouseEvent&) +0x10b (Window.cpp:413)
1888.137 CrashReporter(57:58): 0x000000036185aad9: [/usr/lib/libgui.so.serenity] GUI::Window::event(Core::Event&) [clone .localalias] +0x29 (Window.cpp:771)
1888.137 CrashReporter(57:58): 0x0000000d8f0419a4: [/usr/lib/libcore.so.serenity] Core::EventReceiver::dispatch_event(Core::Event&, Core::EventReceiver*) +0x54 (EventReceiver.cpp:163)
1888.137 CrashReporter(57:58): 0x0000000d8f05fcdb: [/usr/lib/libcore.so.serenity] Core::ThreadEventQueue::process() +0x2eb (ThreadEventQueue.cpp:111)
1888.137 CrashReporter(57:58): 0x0000000d8f03e753: [/usr/lib/libcore.so.serenity] Core::EventLoopImplementationUnix::exec() +0x33 (EventLoopImplementationUnix.cpp:109 => EventLoopImplementationUnix.cpp:101)
1888.137 CrashReporter(57:58): 0x0000000d8f03b11c: [/usr/lib/libcore.so.serenity] Core::EventLoop::exec() +0x4c (EventLoop.cpp:86)
1888.137 CrashReporter(57:58): 0x00000013b5e0afd0: [/bin/Solitaire] serenity_main(Main::Arguments) +0x2490 (main.cpp:241)
1888.137 CrashReporter(57:58): 0x00000013b5dfe9c7: [/bin/Solitaire] main +0x147 (Main.cpp:43)
1888.137 CrashReporter(57:58): 0x00000013b5dfeb24: [/bin/Solitaire] _entry +0x24 (crt0.cpp:41)