windterm 2.6.1 crash when switch ssh tab session, and can be reproduced

[icsfy]

Got stacktrace from gdb:

Thread 1 "WindTerm" received signal SIGSEGV, Segmentation fault.
0x00007ffff3acf63f in QObject::startTimer(int, Qt::TimerType) () from /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
(gdb) bt
#0  0x00007ffff3acf63f in QObject::startTimer(int, Qt::TimerType) () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#1  0x00007ffff3adaceb in QTimer::start() () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#2  0x00000000007e4138 in  ()
#3  0x00000000007e84ca in  ()
#4  0x00000000007910e1 in  ()
#5  0x00007ffff3accda3 in QObject::event(QEvent*) () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#6  0x00007ffff5f6343c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /home/debian/WindTerm_2.6.1/lib/libQt5Widgets.so.5
#7  0x00007ffff5f69f20 in QApplication::notify(QObject*, QEvent*) () at /home/debian/WindTerm_2.6.1/lib/libQt5Widgets.so.5
#8  0x00007ffff3a9d808 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#9  0x00007ffff3aa0882 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#10 0x00007ffff3af9b33 in  () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#11 0x00007ffff731c7a9 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff731ca38 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007ffff731cacc in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007ffff3af91cc in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#15 0x00007ffff3a9c21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#16 0x00007ffff3aa51d3 in QCoreApplication::exec() () at /home/debian/WindTerm_2.6.1/lib/libQt5Core.so.5
#17 0x00000000004e657d in main ()