crash when alt-tabbing citadel

gistfile1.txt

INFO: custom_object.cpp:2609 : RAN GARBAGE COLLECTION IN 1ms. Releasing 0/11 OBJECTS
INFO: formula_function.cpp:3796 : CONSOLE: 'clicked'
ERROR: asserts.cpp:133 : ASSERT FAIL: cairo.cpp:815 ASSERTION FAILED: Invalid canvas render: 0x0

CRITICAL: At modules/Citadel/data/objects/library_deck_summary.cfg 52:
fbo: c.render(area.width, area.height, [
     ^

At modules/Citadel/data/objects/title_multiplayer_controller.cfg 32:
map(_decks, spawn('library_deck_summary', 0, 0, {selected: index = if(selec...
            ^

At modules/Citadel/data/objects/title_multiplayer_controller.cfg 44:
spawn_deck_summaries(),
^---------------------^


---
CRITICAL: stack trace:
CRITICAL:   ./anura : output_backtrace()+0x33
CRITICAL:   ./anura : fatal_assert_failure_exception::fatal_assert_failure_exception(std::string const&)+0xa6
CRITICAL:   ./anura() [0xdcace9]
CRITICAL:   ./anura() [0xdca88c]
CRITICAL:   ./anura : std::function<variant (game_logic::FormulaCallable const&)>::operator()(game_logic::FormulaCallable const&) const+0x35
CRITICAL:   ./anura : variant::operator()(std::vector<variant, std::allocator<variant> > const&) const+0x119f
CRITICAL:   ./anura() [0xfb023b]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xfb6e46]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xf995c4]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xfdc5c1]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xfb855e]
CRITICAL:   ./anura() [0xfb870a]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura : game_logic::Formula::execute(game_logic::FormulaCallable const&) const+0x76
CRITICAL:   ./anura : variant::operator()(std::vector<variant, std::allocator<variant> > const&) const+0xf5e
CRITICAL:   ./anura() [0xffb547]
CRITICAL:   ./anura : CustomObject::executeCommand(variant const&)+0x9f
CRITICAL:   ./anura : CustomObject::executeCommand(variant const&)+0x6c
CRITICAL:   ./anura : CustomObject::setValueBySlot(int, variant const&)+0x14b
CRITICAL:   ./anura() [0xe98157]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xfd6342]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xf995c4]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xfb855e]
CRITICAL:   ./anura() [0xfb870a]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura : game_logic::Formula::execute(game_logic::FormulaCallable const&) const+0x76
CRITICAL:   ./anura : variant::operator()(std::vector<variant, std::allocator<variant> > const&) const+0xf5e
CRITICAL:   ./anura() [0xfb023b]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura() [0xfb855e]
CRITICAL:   ./anura() [0xfb870a]
CRITICAL:   ./anura : game_logic::FormulaExpression::evaluate(game_logic::FormulaCallable const&) const+0x31
CRITICAL:   ./anura : game_logic::Formula::execute(game_logic::FormulaCallable const&) const+0x76
CRITICAL:   ./anura : variant::operator()(std::vector<variant, std::allocator<variant> > const&) const+0xf5e
CRITICAL:   ./anura() [0xffb547]
CRITICAL:   ./anura : CustomObject::executeCommand(variant const&)+0x9f
CRITICAL:   ./anura : CustomObject::executeCommand(variant const&)+0x6c
CRITICAL:   ./anura : CustomObject::handleEventInternal(int, game_logic::FormulaCallable const*, bool)+0x35b
CRITICAL:   ./anura : CustomObject::handleEvent(int, game_logic::FormulaCallable const*)+0xfe
CRITICAL:   ./anura() [0xe8c594]
CRITICAL:   ./anura : EntityCommandCallable::runCommand(Level&, Entity&) const+0x38
CRITICAL:   ./anura : CustomObject::executeCommand(variant const&)+0xe9
CRITICAL:   ./anura : CustomObject::executeCommand(variant const&)+0x6c
CRITICAL:   ./anura : CustomObject::handleEventInternal(int, game_logic::FormulaCallable const*, bool)+0x35b
CRITICAL:   ./anura : CustomObject::handleEvent(int, game_logic::FormulaCallable const*)+0xfe
CRITICAL:   ./anura : LevelRunner::video_resize_event(SDL_Event const&)+0x17a
CRITICAL:   ./anura : LevelRunner::play_cycle()+0x18b6
CRITICAL:   ./anura : LevelRunner::play_level()+0xed
CRITICAL:   ./anura : main()+0x43aa
CRITICAL:   /lib/x86_64-linux-gnu/libc.so.6 : __libc_start_main()+0xf5
CRITICAL:   ./anura() [0xbe9f92]
CRITICAL: ---
terminate called after throwing an instance of 'fatal_assert_failure_exception'
./local_citadel.exe: line 2: 14775 Aborted                 ./anura --module=Citadel --fullscreen --width=1366 --height=768 --server=localhost:23456