Comment # 1 on bug 959272 from Wolfgang Bauer

(In reply to Mindaugas Baranauskas from comment #0)
> Start live-usb-gui. Kdialog crash. I see in terminal:
> 
> kdialog(5709)/kdeui (kdelibs): Session bus not found 
> To circumvent this problem try the following command (with Linux and bash) 
> export $(dbus-launch) 
> KCrash: Application 'kdialog' crashing...
> KCrash: Attempting to start /usr/lib64/kde4/libexec/drkonqi from kdeinit
> KCrash: Connect sock_file=/root/.kde4/socket-DELL-linux/kdeinit4__0
>

What exactly are you doing to get this crash?

Looks like you switch to root via su and try to run kdialog (or whatever) then.
This doesn't work because it won't find the user's dbus session when running as
root.
Use kdesu instead to run it as root, if necessary.