wl 9.5.50 crashing

Hello,

WL crashes once I open and then try to close plugin in Custom Plugin Chain.

here is a crash log:

Process: WaveLab Pro 9.5 [30598]
Path: /Applications/WaveLab Pro 9.5.app/Contents/MacOS/WaveLab Pro 9.5
Identifier: net.steinberg.WaveLab-Pro-9-5
Version: 9.5.50.208 (9.5.50.208)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: WaveLab Pro 9.5 [30598]
User ID: 501

Date/Time: 2019-05-01 16:09:28.215 +0300
OS Version: Mac OS X 10.12.6 (16G1618)
Report Version: 12
Anonymous UUID: CBCB59DD-1D18-0D2C-BBC0-494422A3DF42


Time Awake Since Boot: 12000 seconds

System Integrity Protection: disabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000018
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]

VM Regions Near 0x18:

__TEXT 00000001089ee000-000000010ace5000 [ 35.0M] r-x/rwx SM=COW /Applications/WaveLab Pro 9.5.app/Contents/MacOS/WaveLab Pro 9.5

Application Specific Information:
objc_msgSend() selector name: isKindOfClass:


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x00007fffe64a105d objc_msgSend + 29
1 libqcocoa.dylib 0x000000010fb1e083 QCocoaWindow::isForeignWindow() const + 51
2 libqcocoa.dylib 0x000000010fb1d5b7 QCocoaWindow::~QCocoaWindow() + 343
3 libqcocoa.dylib 0x000000010fb1d9c5 non-virtual thunk to QCocoaWindow::~QCocoaWindow() + 21
4 org.qt-project.QtGui 0x000000010cbce19b QWindowPrivate::destroy() + 555
5 org.qt-project.QtWidgets 0x000000010c411592 QWindowContainer::~QWindowContainer() + 82
6 org.qt-project.QtCore 0x000000010be14f68 QObjectPrivate::deleteChildren() + 200
7 org.qt-project.QtWidgets 0x000000010c3dc6f2 QWidget::~QWidget() + 1074
8 net.steinberg.WaveLab-Pro-9-5 0x0000000109cd65be 0x1089ee000 + 19826110
9 org.qt-project.QtCore 0x000000010be14f68 QObjectPrivate::deleteChildren() + 200
10 org.qt-project.QtWidgets 0x000000010c3dc6f2 QWidget::~QWidget() + 1074
11 net.steinberg.WaveLab-Pro-9-5 0x0000000109cc77ee 0x1089ee000 + 19765230
12 org.qt-project.QtCore 0x000000010be156e2 QObject::event(QEvent*) + 146
13 org.qt-project.QtWidgets 0x000000010c3eeece QWidget::event(QEvent*) + 4926
14 org.qt-project.QtWidgets 0x000000010c4fe445 QMainWindow::event(QEvent*) + 277
15 net.steinberg.WaveLab-Pro-9-5 0x0000000109cd545c 0x1089ee000 + 19821660
16 org.qt-project.QtWidgets 0x000000010c3b0dad QApplicationPrivate::notify_helper(QObject*, QEvent*) + 269
17 org.qt-project.QtWidgets 0x000000010c3b21bb QApplication::notify(QObject*, QEvent*) + 555
18 libqtx.dylib 0x000000010b2e9bcd TGuiApplication::notify(QObject*, QEvent*) + 3357
19 net.steinberg.WaveLab-Pro-9-5 0x000000010961a055 0x1089ee000 + 12763221
20 org.qt-project.QtCore 0x000000010bdebdb8 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 168
21 org.qt-project.QtCore 0x000000010bdecfa8 QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 840
22 libqcocoa.dylib 0x000000010fb36d37 QCocoaEventDispatcherPrivate::processPostedEvents() + 183
23 libqcocoa.dylib 0x000000010fb37601 QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) + 33
24 com.apple.CoreFoundation 0x00007fffd1609241 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
25 com.apple.CoreFoundation 0x00007fffd15ea13d __CFRunLoopDoSources0 + 557
26 com.apple.CoreFoundation 0x00007fffd15e9636 __CFRunLoopRun + 934
27 com.apple.CoreFoundation 0x00007fffd15e9034 CFRunLoopRunSpecific + 420
28 com.apple.HIToolbox 0x00007fffd0b49ebc RunCurrentEventLoopInMode + 240
29 com.apple.HIToolbox 0x00007fffd0b49bf9 ReceiveNextEventCommon + 184
30 com.apple.HIToolbox 0x00007fffd0b49b26 _BlockUntilNextEventMatchingListInModeWithFilter + 71
31 com.apple.AppKit 0x00007fffcf0dea54 _DPSNextEvent + 1120
32 com.apple.AppKit 0x00007fffcf85a7ee -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2796
33 com.apple.AppKit 0x00007fffcf0d33db -[NSApplication run] + 926
34 libqcocoa.dylib 0x000000010fb3638d QCocoaEventDispatcher::processEvents(QFlagsQEventLoop::ProcessEventsFlag) + 2381
35 org.qt-project.QtCore 0x000000010bde792e QEventLoop::exec(QFlagsQEventLoop::ProcessEventsFlag) + 398
36 org.qt-project.QtCore 0x000000010bdec4b1 QCoreApplication::exec() + 369
37 net.steinberg.WaveLab-Pro-9-5 0x000000010962c53b 0x1089ee000 + 12838203
38 libdyld.dylib 0x00007fffe6de8235 start + 1