Project deselects itself!

Hello i have a small annoying problem which i am hoping someone could help me solve. I am making a platform game and in the first frame a have made a little menu where the player can choose his character by clicking on it. When it is clicked a function is fired containing the line nextFrame(); Everything works as it should except i have to click on the screen to select it before i can move the character. Anyone who has a clue how to solve it?

Thank you in advance!