when closing an _ABE window:
not sure how useful this backtrace is, but here you go.
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libSystem.B.dylib 0x00007fff8429c886 __kill + 10
1 libSystem.B.dylib 0x00007fff8433ceae abort + 83
2 libSystem.B.dylib 0x00007fff84254a75 free + 128
3 QtCore 0x0000000102342d9f QObjectPrivate::deleteChildren() + 95
4 QtGui 0x00000001016faacd QWidget::~QWidget() + 493
5 ...iades-astrophoto.PixInsight 0x00000001002553c8 pi::ImageView::~ImageView() + 232
6 QtCore 0x0000000102342d9f QObjectPrivate::deleteChildren() + 95
7 QtGui 0x00000001016faacd QWidget::~QWidget() + 493
8 ...iades-astrophoto.PixInsight 0x000000010027d5f1 pi::ImageWindow::~ImageWindow() + 1489
9 QtCore 0x000000010242be02 QObject::event(QEvent*) + 1154
10 QtGui 0x00000001016fd9c3 QWidget::event(QEvent*) + 67
11 QtGui 0x00000001016a8d9e QApplicationPrivate::notify_helper(QObject*, QEvent*) + 190
12 QtGui 0x00000001016ad49b QApplication::notify(QObject*, QEvent*) + 2059
13 ...iades-astrophoto.PixInsight 0x0000000100156871 pi::PixInsightApplication::notify(QObject*, QEvent*) + 33
14 QtCore 0x000000010233d85f QCoreApplication::notifyInternal(QObject*, QEvent*) + 127
15 QtCore 0x000000010241f8c4 QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 564
16 com.apple.CoreFoundation 0x00007fff87bb1f21 __CFRunLoopDoSources0 + 1361
17 com.apple.CoreFoundation 0x00007fff87bb0119 __CFRunLoopRun + 873
18 com.apple.CoreFoundation 0x00007fff87baf8df CFRunLoopRunSpecific + 575
19 com.apple.HIToolbox 0x00007fff863b7ada RunCurrentEventLoopInMode + 333
20 com.apple.HIToolbox 0x00007fff863b783d ReceiveNextEventCommon + 148
21 com.apple.HIToolbox 0x00007fff863b7798 BlockUntilNextEventMatchingListInMode + 59
22 com.apple.AppKit 0x00007fff8317ba2a _DPSNextEvent + 708
23 com.apple.AppKit 0x00007fff8317b379 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
24 com.apple.AppKit 0x00007fff8314105b -[NSApplication run] + 395
25 QtGui 0x0000000101669b70 QDesktopWidget::resizeEvent(QResizeEvent*) + 11376
26 QtCore 0x000000010241e4fc QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 60
27 QtCore 0x000000010241e824 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 180
28 QtGui 0x0000000101ab35a4 QMenu::exec(QPoint const&, QAction*) + 116
29 ...iades-astrophoto.PixInsight 0x0000000100270867 pi::ImageView::mousePressEvent(QMouseEvent*) + 2759
30 QtGui 0x00000001016fe4a4 QWidget::event(QEvent*) + 2852
31 QtGui 0x0000000101a70f1c QFrame::event(QEvent*) + 44
32 QtGui 0x0000000101af7f87 QAbstractScrollArea::viewportEvent(QEvent*) + 23
33 ...iades-astrophoto.PixInsight 0x0000000100264cdf pi::ImageView::viewportEvent(QEvent*) + 79
34 QtGui 0x0000000101afa4a0 QAbstractScrollArea::qt_metacall(QMetaObject::Call, int, void**) + 400
35 QtCore 0x000000010241ee5b QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) + 155
36 QtGui 0x00000001016a8d6e QApplicationPrivate::notify_helper(QObject*, QEvent*) + 142
37 QtGui 0x00000001016ad5c0 QApplication::notify(QObject*, QEvent*) + 2352
38 ...iades-astrophoto.PixInsight 0x0000000100156871 pi::PixInsightApplication::notify(QObject*, QEvent*) + 33
39 QtCore 0x000000010233d85f QCoreApplication::notifyInternal(QObject*, QEvent*) + 127
40 QtGui 0x00000001016a902c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 844
41 QtGui 0x00000001016649fd QMacCocoaAutoReleasePool::~QMacCocoaAutoReleasePool() + 12045
42 com.apple.AppKit 0x00007fff83275c3b -[NSWindow sendEvent:] + 8769
43 QtGui 0x000000010165e18e QMacInputContext::reset() + 31022
44 com.apple.AppKit 0x00007fff831aa662 -[NSApplication sendEvent:] + 4719
45 QtGui 0x0000000101667baa QDesktopWidget::resizeEvent(QResizeEvent*) + 3242
46 QtGui 0x0000000101669a24 QDesktopWidget::resizeEvent(QResizeEvent*) + 11044
47 QtCore 0x000000010241fd4f QCoreApplication::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 63
48 ...iades-astrophoto.PixInsight 0x0000000100b14566 pi::ConsumeEvents() + 38
49 ...iades-astrophoto.PixInsight 0x0000000100b159e5 pi::FadingWidgetAnimation::NextFadeOutStep() + 133
50 ...iades-astrophoto.PixInsight 0x000000010006c436 pi::FadingWidgetAnimation::qt_metacall(QMetaObject::Call, int, void**) + 54
51 QtCore 0x000000010242bde5 QObject::event(QEvent*) + 1125
52 QtGui 0x00000001016a8d9e QApplicationPrivate::notify_helper(QObject*, QEvent*) + 190
53 QtGui 0x00000001016ad49b QApplication::notify(QObject*, QEvent*) + 2059
54 ...iades-astrophoto.PixInsight 0x0000000100156871 pi::PixInsightApplication::notify(QObject*, QEvent*) + 33
55 QtCore 0x000000010233d85f QCoreApplication::notifyInternal(QObject*, QEvent*) + 127
56 QtCore 0x000000010241f8c4 QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 564
57 com.apple.CoreFoundation 0x00007fff87bb1f21 __CFRunLoopDoSources0 + 1361
58 com.apple.CoreFoundation 0x00007fff87bb0119 __CFRunLoopRun + 873
59 com.apple.CoreFoundation 0x00007fff87baf8df CFRunLoopRunSpecific + 575
60 com.apple.HIToolbox 0x00007fff863b7ada RunCurrentEventLoopInMode + 333
61 com.apple.HIToolbox 0x00007fff863b783d ReceiveNextEventCommon + 148
62 com.apple.HIToolbox 0x00007fff863b7798 BlockUntilNextEventMatchingListInMode + 59
63 com.apple.AppKit 0x00007fff8317ba2a _DPSNextEvent + 708
64 com.apple.AppKit 0x00007fff8317b379 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
65 QtGui 0x0000000101669ac6 QDesktopWidget::resizeEvent(QResizeEvent*) + 11206
66 QtCore 0x000000010241fd4f QCoreApplication::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 63
67 ...iades-astrophoto.PixInsight 0x000000010016de2b pi::AutoHideWidget::Hide(bool) + 379
68 ...iades-astrophoto.PixInsight 0x000000010000b42b pi::AutoHideWidget::qt_metacall(QMetaObject::Call, int, void**) + 347
69 QtCore 0x00000001023443c7 QMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 599
70 QtGui 0x0000000101cfa461 QAbstractButton::clicked(bool) + 49
71 QtGui 0x0000000101a28321 QAbstractButton::mousePressEvent(QMouseEvent*) + 209
72 QtGui 0x0000000101a29240 QAbstractButton::keyPressEvent(QKeyEvent*) + 832
73 QtGui 0x0000000101a29491 QAbstractButton::mouseReleaseEvent(QMouseEvent*) + 113
74 QtGui 0x0000000101af4082 QToolButton::mouseReleaseEvent(QMouseEvent*) + 18
75 QtGui 0x00000001016fe2a8 QWidget::event(QEvent*) + 2344
76 QtGui 0x0000000101a28528 QAbstractButton::event(QEvent*) + 40
77 QtGui 0x0000000101af5a2f QToolButton::event(QEvent*) + 63
78 QtGui 0x00000001016a8d9e QApplicationPrivate::notify_helper(QObject*, QEvent*) + 190
79 QtGui 0x00000001016ad5c0 QApplication::notify(QObject*, QEvent*) + 2352
80 ...iades-astrophoto.PixInsight 0x0000000100156871 pi::PixInsightApplication::notify(QObject*, QEvent*) + 33
81 QtCore 0x000000010233d85f QCoreApplication::notifyInternal(QObject*, QEvent*) + 127
82 QtGui 0x00000001016a902c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 844
83 QtGui 0x00000001016649fd QMacCocoaAutoReleasePool::~QMacCocoaAutoReleasePool() + 12045
84 QtGui 0x00000001016578a6 QMacInputContext::reset() + 4166
85 com.apple.AppKit 0x00007fff83274fa5 -[NSWindow sendEvent:] + 5547
86 QtGui 0x000000010165e18e QMacInputContext::reset() + 31022
87 com.apple.AppKit 0x00007fff831aa662 -[NSApplication sendEvent:] + 4719
88 com.apple.AppKit 0x00007fff831410aa -[NSApplication run] + 474
89 QtGui 0x0000000101669b70 QDesktopWidget::resizeEvent(QResizeEvent*) + 11376
90 QtCore 0x000000010241e4fc QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 60
91 QtCore 0x000000010241e824 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 180
92 QtCore 0x000000010241fbbc QCoreApplication::exec() + 172
93 ...iades-astrophoto.PixInsight 0x0000000100bc22b8 main + 19608
94 ...iades-astrophoto.PixInsight 0x000000010000a598 start + 52