How to prevent GNU Cash from starting automatically with KDE?

Something gone wrong several days ago with GNU Cash application, so every time I reboot a computer or DE now it starts automatically with KDE and says "GNU Cash could not obtain the lock for file ...". I looked for autostart, but can't see GNU Cash neither in /usr/share/autostart/ nor in GUI via System Settings -> Startup and Shutdown -> Autostart. How can I prevent it from starting automatically? Let me know if you need more details.

My desktop is KDE 4.14.32 on Slackware 14.2.