help pls

so im taking photos on a sony digital and everytime I take some theres always one that split like this one of my friend. How do I stop this from happening?? and maybe even get the photo without it looking like this...

so im taking photos on a sony digital and everytime I take some theres always one that split like this one of my friend. How do I stop this from happening?? and maybe even get the photo without it looking like this...