Segfault when selecting port

[Andy1978]

Star qmodus, select "Modbus RTU", enable checkbox "Active". The dropdown choice "Serial Port" is now filled with "/dev/ttyS0.../dev/ttyS3", now deactivate "Active" and click it again. The dropdown choice now contains the entries doubled. If you now click on a doubled port you'll see a segfault:

Program received signal SIGSEGV, Segmentation fault.
QString (other=..., this=0x7fffffffd180) at /usr/include/qt4/QtCore/qstring.h:726
726 { Q_ASSERT(&other != this); d->ref.ref(); }
(gdb) bt
#0 QString (other=..., this=0x7fffffffd180) at /usr/include/qt4/QtCore/qstring.h:726
#1 SerialSettingsWidget::changeSerialPort (this=0x6c2f30)

at /home/andy/src/qmodbus/src/serialsettingswidget.cpp:97

#2 0x000000000042468b in SerialSettingsWidget::qt_static_metacall (_o=, _c=,

_id=<optimized out>, _a=<optimized out>) at /home/andy/src/qmodbus/build/src/moc_serialsettingswidget.cxx:55

#3 0x00007ffff6d9871c in QMetaObject::activate(QObject_, QMetaObject const_, int, void**) ()

from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007ffff769e4e1 in QComboBox::currentIndexChanged(int) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4