I had previously built a different version of this bone farm, which would also cause a crash, so I had to look for a different solution. I basically copied my new design from another player where this farm had been working fine. It involves a lua controller which is working too fast for me to have a chance to get on the server and stop the whole thing before the server crashes yet again.
To fix this somebody will have to disable pipeworks or mesecons, go to the garden behind my house (which you can reach through travelnet) and remove the luacontroller on the floor.
I am very sorry