How to stop my chickens eating their eggs

[claireree]

I have 7 eggs and they recently have started laying less eggs, I live in Spain so not sure if its down to the weather but the other problem Im having it that one of them keeps cracking and eating the eggs today they done it again, I know once they have a taste for it but is there any way of stopping this

 

[mohillbilly]

feed oyster shells and if that doesn't work time to have chicken for dinner.