Comment 2 for bug 29602

Same problem here, in my case I suspect that it's due to XIM (or qtimmodule) because when I close my XIM (nabi) alone having same problem and when I log off KDE without the XIM I don't have this problem. I will attach my backtrace.

And setup for XIM is in .kde/env/nabi.sh like this.

export XMODIFIERS="@im=nabi"
export XIM_PROGRAM=/usr/bin/nabi
export GTK_IM_MODULE=xim
export QT_IM_MODULE=xim