Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000021
0x0000000106701bdd in QMetaObject::changeGuard ()
(gdb) bt
#0  0x0000000106701bdd in QMetaObject::changeGuard ()
#1  0x00000001050fdfa5 in qt_mac_updateCursorWithWidgetUnderMouse ()
#2  0x0000000105126968 in qt_mac_handleMouseEvent ()
#3  0x000000010511ba94 in -[QCocoaWindow sendEvent:] ()
#4  0x00007fff82b8bafa in -[NSApplication sendEvent:] ()
#5  0x0000000105120b34 in -[QNSApplication sendEvent:] ()
#6  0x00007fff82b226de in -[NSApplication run] ()
#7  0x000000010512b9b0 in QEventDispatcherMac::processEvents ()
#8  0x00000001066eb034 in QEventLoop::processEvents ()
#9  0x00000001066eb3e4 in QEventLoop::exec ()
#10 0x00000001066ed7fc in QCoreApplication::exec ()
#11 0x000000010003f6e9 in Gui::Application::runApplication () at /Users/family/FreeCAD/FreeCAD-src/src/Gui/Application.cpp:1785
#12 0x000000010000a61b in main (argc=1, argv=0x7fff5fbff978)