A lift detection arrangement in a robotic lawnmower for detecting a lift of a body (102) of the robotic lawnmower relative to a chassis (125) of the robotic lawnmower. The lift detection arrangement comprises a collision absorber (103)； and a sensor arrangement comprising a spring (113), a movable part (115), a metal plate (119) and a sensor (123). The collision absorber (103) is rigidly attached to the movable part (115) and arranged to allow a displacement of the body (102) relative to the chassis (125) in a collision plane during a collision between an obstacle and the robotic lawnmower, but not in a vertical direction. The moveable part (115) is arranged to provide a displacement of the body (102) relative to the chassis (125) in a lift direction during a lift of the body (102). The sensor (123) is configured to sense the distance (d) to the metal plate (119) that is fixed to the moveable part (115) and to trigger a cut off of power to a cutting blade of the robotic lawnmower if the distance becomes greater than a predetermined distance.
