Probably govde is invalid. You have two options:

1)
if(govde) {
camera.x = govde.x - 25 * cos(govde.pan);
camera.y = govde.y - 25 * sin(govde.pan);
camera.z = govde.z + 25;
camera.pan = govde.pan;
}


2)
while(!govde) { wait(1); }
while(1) {
camera.x = govde.x - 25 * cos(govde.pan);
camera.y = govde.y - 25 * sin(govde.pan);
camera.z = govde.z + 25;
camera.pan = govde.pan;
wait(1);
}