fix segfault on exit/restart after having opened a custommenu
fix segfault on exit/restart after having opened a custommenu

luebking/fluxbox,luebking/fluxbox,naimdjon/fluxbox,lukoko/fluxbox,olivergondza/fluxbox,luebking/fluxbox,olivergondza/fluxbox,olivergondza/fluxbox,lukoko/fluxbox,Arkq/fluxbox,Arkq/fluxbox,luebking/fluxbox,naimdjon/fluxbox,naimdjon/fluxbox,naimdjon/fluxbox,naimdjon/fluxbox,lukoko/fluxbox,luebking/fluxbox,olivergondza/fluxbox,Arkq/fluxbox,lukoko/fluxbox,Arkq/fluxbox,Arkq/fluxbox,olivergondza/fluxbox,lukoko/fluxbox