[Bug 203082] misc/qt5ct www/qupzilla-qt5 crashes after installation of misc/qt5ct

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203082

            Bug ID: 203082
           Summary: misc/qt5ct www/qupzilla-qt5 crashes after installation
                    of misc/qt5ct
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: makc at FreeBSD.org
          Reporter: will_brokenbourgh at yahoo.com
             Flags: maintainer-feedback?(makc at FreeBSD.org)
          Assignee: makc at FreeBSD.org

After installation of this port, qupzilla-qt5 crashes.

Here is the output of gdb qupzilla:
- - -
    (gdb) r
    Starting program: /usr/bin/qupzilla 
    [New LWP 101223]
    [New Thread 812406400 (LWP 101223/qupzilla)]
    using qt5ct plugin

    Program received signal SIGSEGV, Segmentation fault.
    [Switching to Thread 812406400 (LWP 101223/qupzilla)]
    0x0000000805c71fe8 in QObject::objectName () from
/usr/local/lib/libQt5Core.so.5
    (gdb) bt
    #0  0x0000000805c71fe8 in QObject::objectName () from
/usr/local/lib/libQt5Core.so.5
    #1  0x0000000800c31d6f in MainApplication::styleName (this=0x7fffffffe460)
at app/mainapplication.cpp:457
    #2  0x0000000800e05a9c in ComboTabBar::setUpLayout (this=0x8124d4c60) at
tabwidget/combotabbar.cpp:524
    #3  0x0000000800e06516 in ComboTabBar::eventFilter (this=0x8124d4c60,
obj=0x85b1c00b0, ev=0x7fffffffc9e8) at tabwidget/combotabbar.cpp:626
    #4  0x0000000805c4875c in
QCoreApplicationPrivate::sendThroughObjectEventFilters () from
/usr/local/lib/libQt5Core.so.5
    #5  0x0000000801b6af0d in QApplicationPrivate::notify_helper () from
/usr/local/lib/libQt5Widgets.so.5
    #6  0x0000000801b6e839 in QApplication::notify () from
/usr/local/lib/libQt5Widgets.so.5
    #7  0x0000000805c48473 in QCoreApplication::notifyInternal () from
/usr/local/lib/libQt5Core.so.5
- - -

The source of www/qupzilla-qt5 that is crashing is in
'src/lib/app/mainapplication.cpp:457 which is:
- - -
    QString MainApplication::styleName() const
    {
        return m_proxyStyle ? m_proxyStyle->baseStyle()->objectName() :
style()->objectName();
    }

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