Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: 13 at address: 0x0000000000000000 0x000000010012eaca in std::__1::__tree_min*> () at /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/__tree:133 133 { (gdb) bt #0 0x000000010012eaca in std::__1::__tree_min*> () at /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/__tree:133 #1 0x000000010012eaca in std::__1::__tree_next const*> (__x=0x10f0e2070) at __tree:157 #2 0x0000000100234c19 in std::__1::__tree_const_iterator, std::__1::__tree_node, void*> const*, long>::operator++ () at /Users/antonio/MuseScore/mscore/seq.cpp:1195 #3 0x0000000100234c19 in std::__1::__map_const_iterator, std::__1::__tree_node, void*> const*, long> >::operator++ () at /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/map:641 #4 0x0000000100234c19 in Ms::Seq::heartBeatTimeout (this=0x10cf59000) at /Users/antonio/MuseScore/mscore/seq.cpp:157 #5 0x0000000100014138 in Ms::Seq::qt_static_metacall (_o=0x10cf59000, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x7fff5fbfcf68) at /Users/antonio/MuseScore/build.debug/mscore/moc_seq.cpp:121 #6 0x0000000101bb0591 in QMetaObject::activate () #7 0x0000000101ba92f3 in QObject::event () #8 0x0000000103427077 in QApplicationPrivate::notify_helper () #9 0x000000010342a869 in QApplication::notify () #10 0x0000000101b8159e in QCoreApplication::notifyInternal () #11 0x0000000101bcb383 in QTimerInfoList::activateTimers () #12 0x000000010823ac85 in qt_plugin_instance () #13 0x00007fff8ceff101 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ () #14 0x00007fff8cefea25 in __CFRunLoopDoSources0 () #15 0x00007fff8cf21dc5 in __CFRunLoopRun () #16 0x00007fff8cf216b2 in CFRunLoopRunSpecific () #17 0x00007fff873690a4 in RunCurrentEventLoopInMode () #18 0x00007fff87368e42 in ReceiveNextEventCommon () #19 0x00007fff87368cd3 in BlockUntilNextEventMatchingListInMode () #20 0x00007fff859cc613 in _DPSNextEvent () #21 0x00007fff859cbed2 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] () #22 0x00007fff859c3283 in -[NSApplication run] () #23 0x000000010823b52b in qt_plugin_instance () #24 0x0000000101b7ea33 in QEventLoop::exec () #25 0x0000000101b81b25 in QCoreApplication::exec () #26 0x00000001001a4500 in main (argc=2, av=0x7fff5fbffb60) at /Users/antonio/MuseScore/mscore/musescore.cpp:4941 (gdb) up #1 0x000000010012eaca in std::__1::__tree_next const*> (__x=0x10f0e2070) at __tree:157 133 { (gdb) up #2 0x0000000100234c19 in std::__1::__tree_const_iterator, std::__1::__tree_node, void*> const*, long>::operator++ () at /Users/antonio/MuseScore/mscore/seq.cpp:1195 1195 for (;guiPos != events.cend(); ++guiPos) { (gdb) info locals sc = ('Ms::SynthControl' *) 0x0 ppos = { __i_ = { __ptr_ = 0x10f158030 } } pre = ('Ms::PianorollEditor' *) 0x112aed578 endTime = 101046 r = { xp = 0, yp = 0, w = 0, h = 0 } utick = 1 tick = 178656000