QtWebEngine crashes (QWebEngineUrlScheme)

[11808:8756:0211/133834.395:FATAL:sequenced_task_runner_handle.cc(33)] Check failed: ThreadTaskRunnerHandle::IsSet(). Error: This caller requires a sequenced context (i.e. the current task needs to run from a SequencedTaskRunner).
Backtrace:
        QWebEngineUrlScheme::QWebEngineUrlScheme [0x00007FFD0C133435+329989]
        QWebEngineUrlScheme::QWebEngineUrlScheme [0x00007FFD0C1439A3+396915]
        base::RefCountedThreadSafe<QtWebEngineCore::CookieMonsterDelegateQt,base::DefaultRefCountedThreadSafeTraits<QtWebEngineCore::CookieMonsterDelegateQt> >::RefCountedThreadSafe<QtWebEngineCore::CookieMonsterDelegateQt,base::DefaultRefCountedThreadSafeTraits< [0x00007FFD0C0C7D0B+80171]
        QWebEngineUrlScheme::QWebEngineUrlScheme [0x00007FFD0C0F9A47+93975]
        QtWebEngineCore::FilePickerController::mode [0x00007FFD0C3141FA+1760394]
        QtWebEngineCore::FilePickerController::mode [0x00007FFD0C3107F0+1745536]
        QtWebEngineCore::PdfiumDocumentWrapperQt::pageAsQImage [0x00007FFD0AD15A7A+19258]
        QtWebEngineCore::PdfiumDocumentWrapperQt::pageAsQImage [0x00007FFD0AD17618+26328]
        QtWebEngineCore::PdfiumDocumentWrapperQt::pageAsQImage [0x00007FFD0AD16669+22313]
        QtWebEngineCore::WebContentsAdapter::~WebContentsAdapter [0x00007FFD0ACF03A4+116]
        QWebEngineView::`default constructor closure' [0x00007FFD4BAF5E6F+1039]
        QWebEnginePage::~QWebEnginePage [0x00007FFD4BAF413B+443]
        QWebEnginePage::~QWebEnginePage [0x00007FFD4BAF5A2F+6831]
        QObjectPrivate::deleteChildren [0x00007FFD1676CE93+147]
        QWidget::~QWidget [0x00007FFD33CD8025+1557]
        (No symbol) [0x00007FFD4ACB79D8]
        QObjectPrivate::deleteChildren [0x00007FFD1676CE93+147]
        QWidget::~QWidget [0x00007FFD33CD8025+1557]
        (No symbol) [0x00007FFD187FF8F8]
        QObjectPrivate::deleteChildren [0x00007FFD1676CE93+147]
        QWidget::~QWidget [0x00007FFD33CD8025+1557]
        (No symbol) [0x00007FFD18667BD8]
        SbkDeallocWrapper [0x00007FFD5AB27D1E+670]
        PyObject_CallFunctionObjArgs [0x00000000700E312F+1167]
        PyObject_IsSubclass [0x00000000700DDB58+1520]
        PyMethod_ClearFreeList [0x00000000700A1A20+1732]
        PyMethod_ClearFreeList [0x00000000700A1648+748]
        PyMethod_ClearFreeList [0x00000000700A1567+523]
        PyObject_GC_Malloc [0x00000000700B1F1A+202]
        PyTuple_New [0x00000000700DF2A0+256]
        PyEval_EvalFrameDefault [0x00000000700E9129+2185]
        PyObject_Free [0x00000000700E5728+1000]
        PyCompile_OpcodeStackEffect [0x00000000700D2DF5+1257]
        PyObject_IsSubclass [0x00000000700DD7B0+584]
        PyEval_EvalFrameDefault [0x00000000700E9955+4277]
        PyObject_GetAttr [0x00000000700E82E0+1376]
        PyEval_EvalFrameDefault [0x00000000700E8B4E+686]
        PyObject_Free [0x00000000700E5728+1000]
        PyCompile_OpcodeStackEffect [0x00000000700D2DF5+1257]
        PyObject_IsSubclass [0x00000000700DD7B0+584]
        PyEval_EvalFrameDefault [0x00000000700E9955+4277]
        PyObject_GetAttr [0x00000000700E82E0+1376]
        PyEval_EvalFrameDefault [0x00000000700E8B4E+686]
        PyObject_GetAttr [0x00000000700E82E0+1376]
        PyEval_EvalFrameDefault [0x00000000700E8B4E+686]
        PyFunction_FastCallDict [0x00000000700E3B53+211]
        PyObject_ClearWeakRefs [0x00000000700E3A06+2010]
        PyObject_Call [0x00000000700DF99C+92]
        PyOS_SigintEvent [0x00000000701A227C+5204]
        PyThread_start_new_thread [0x0000000070240CFA+390]
        o_exp [0x00007FFD727F03BA+90]
        BaseThreadInitThunk [0x00007FFD750181F4+20]
        RtlUserThreadStart [0x00007FFD7674A251+33]