macOS exception when adding QAction to QMenu

./qt5menubar.app/Contents/MacOS/qt5menubar 
menu item "E&xit" has unsupported role 0
menu item "&Copy" has unsupported role 0
menu item "C&ut" has unsupported role 0
menu item "&Paste" has unsupported role 0
2016-11-30 23:08:07.597 qt5menubar[39068:2823790] *** Assertion failure in -[NSMenu insertItem:atIndex:], /Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1404.47/Menus.subproj/NSMenu.m:713
2016-11-30 23:08:07.599 qt5menubar[39068:2823790] An uncaught exception was raised
2016-11-30 23:08:07.600 qt5menubar[39068:2823790] Item to be inserted into menu already is in another menu
2016-11-30 23:08:07.600 qt5menubar[39068:2823790] (
	0   CoreFoundation                      0x00007fff9766c452 __exceptionPreprocess + 178
	1   libobjc.A.dylib                     0x00007fff8f42073c objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff9767112a +[NSException raise:format:arguments:] + 106
	3   Foundation                          0x00007fff8c414856 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
	4   AppKit                              0x00007fff84986803 -[NSMenu insertItem:atIndex:] + 318
	5   libqcocoa.dylib                     0x000000010af3aa04 _ZN10QCocoaMenu12insertNativeEP14QCocoaMenuItemS1_ + 452
	6   libqcocoa.dylib                     0x000000010af3af94 _ZN10QCocoaMenu12syncMenuItemEP17QPlatformMenuItem + 500
	7   libqcocoa.dylib                     0x000000010af3f144 _ZN13QCocoaMenuBar8syncMenuEP13QPlatformMenu + 372
	8   libqcocoa.dylib                     0x000000010af3e446 _ZN13QCocoaMenuBar24updateMenuBarImmediatelyEv + 630
	9   libqcocoa.dylib                     0x000000010af3ed1f _ZN13QCocoaMenuBar10insertMenuEP13QPlatformMenuS1_ + 1055
	10  QtWidgets                           0x0000000107063954 _ZN8QMenuBar11actionEventEP12QActionEvent + 1140
	11  QtWidgets                           0x0000000106f16db0 _ZN7QWidget5eventEP6QEvent + 384
	12  QtWidgets                           0x0000000107063e92 _ZN8QMenuBar5eventEP6QEvent + 482
	13  QtWidgets                           0x0000000106ed5746 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 294
	14  QtWidgets                           0x0000000106ed6ca8 _ZN12QApplication6notifyEP7QObjectP6QEvent + 504
	15  QtCore                              0x0000000107df1f24 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 164
	16  QtWidgets                           0x0000000106f0ae2f _ZN7QWidget12insertActionEP7QActionS1_ + 431
	17  QtWidgets                           0x0000000107062030 _ZN8QMenuBar7addMenuEP5QMenu + 32
	18  qt5menubar                          0x0000000106eb2835 _ZL10createMenuP8QMenuBar + 2149
	19  qt5menubar                          0x0000000106eb1ddd main + 269
	20  qt5menubar                          0x0000000106eb1cc4 start + 52
	21  ???                                 0x0000000000000001 0x0 + 1
)
2016-11-30 23:08:07.600 qt5menubar[39068:2823790] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Item to be inserted into menu already is in another menu'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff9766c452 __exceptionPreprocess + 178
	1   libobjc.A.dylib                     0x00007fff8f42073c objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff9767112a +[NSException raise:format:arguments:] + 106
	3   Foundation                          0x00007fff8c414856 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
	4   AppKit                              0x00007fff84986803 -[NSMenu insertItem:atIndex:] + 318
	5   libqcocoa.dylib                     0x000000010af3aa04 _ZN10QCocoaMenu12insertNativeEP14QCocoaMenuItemS1_ + 452
	6   libqcocoa.dylib                     0x000000010af3af94 _ZN10QCocoaMenu12syncMenuItemEP17QPlatformMenuItem + 500
	7   libqcocoa.dylib                     0x000000010af3f144 _ZN13QCocoaMenuBar8syncMenuEP13QPlatformMenu + 372
	8   libqcocoa.dylib                     0x000000010af3e446 _ZN13QCocoaMenuBar24updateMenuBarImmediatelyEv + 630
	9   libqcocoa.dylib                     0x000000010af3ed1f _ZN13QCocoaMenuBar10insertMenuEP13QPlatformMenuS1_ + 1055
	10  QtWidgets                           0x0000000107063954 _ZN8QMenuBar11actionEventEP12QActionEvent + 1140
	11  QtWidgets                           0x0000000106f16db0 _ZN7QWidget5eventEP6QEvent + 384
	12  QtWidgets                           0x0000000107063e92 _ZN8QMenuBar5eventEP6QEvent + 482
	13  QtWidgets                           0x0000000106ed5746 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 294
	14  QtWidgets                           0x0000000106ed6ca8 _ZN12QApplication6notifyEP7QObjectP6QEvent + 504
	15  QtCore                              0x0000000107df1f24 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 164
	16  QtWidgets                           0x0000000106f0ae2f _ZN7QWidget12insertActionEP7QActionS1_ + 431
	17  QtWidgets                           0x0000000107062030 _ZN8QMenuBar7addMenuEP5QMenu + 32
	18  qt5menubar                          0x0000000106eb2835 _ZL10createMenuP8QMenuBar + 2149
	19  qt5menubar                          0x0000000106eb1ddd main + 269
	20  qt5menubar                          0x0000000106eb1cc4 start + 52
	21  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6