Crash when changing font

When you change the output window font in Mudlet, it will crash. This is on r29

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f21039986f0 (LWP 9386)]
0x000000000041e254 in TConsole::changeColors ()
Current language: auto; currently asm
(gdb) bt
#0 0x000000000041e254 in TConsole::changeColors ()
#1 0x00000000004b4998 in dlgProfilePreferences::setDisplayFont ()
#2 0x00000000004c0432 in dlgProfilePreferences::qt_metacall ()
#3 0x00007f2101499134 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#4 0x00007f21021c6737 in QAbstractButton::clicked ()
   from /usr/lib/libQtGui.so.4
#5 0x00007f2101f4a88b in ?? () from /usr/lib/libQtGui.so.4
#6 0x00007f2101f4c452 in ?? () from /usr/lib/libQtGui.so.4
#7 0x00007f2101f4c6a5 in QAbstractButton::mouseReleaseEvent ()
   from /usr/lib/libQtGui.so.4
#8 0x00007f2101c92359 in QWidget::event () from /usr/lib/libQtGui.so.4
#9 0x00007f2101c3fc3d in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#10 0x00007f2101c4825a in QApplication::notify () from /usr/lib/libQtGui.so.4
#11 0x00007f2101484d61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#12 0x00007f2101c475f8 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#13 0x00007f2101cabc19 in ?? () from /usr/lib/libQtGui.so.4
#14 0x00007f2101caa637 in QApplication::x11ProcessEvent ()
   from /usr/lib/libQtGui.so.4
#15 0x00007f2101cd22f4 in ?? () from /usr/lib/libQtGui.so.4
#16 0x00007f20ff476d3b in g_main_context_dispatch ()
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