SLOS ANGELES: Gerard Butler is terrified of losing his mum. The 'Olympus Has Fallen' actor - who was brought up by his mother after his dad walked out when he was a child before later reuniting with him - says not knowing his father for 14 years had a big impact on his life and left him hugely dependent on his parent. He said: ''It made me very dependent on my mother, in a good way, as I do have an amazing mother. I used to have nightmares about it all the time. I was often on a beach, kneeling on some board and the board wouldn't move, and my mother would be calling me, and I couldn't get to her.''–SS