1. A safety device for safeguarding a movable, guided movement element against undesired collisions with an object situated on a movement path of the movement element, said device comprising: a plurality of sensors for detecting the object and the movement element and for outputting signals depending on the detection, and an evaluation unit for evaluating the signals from the plurality of sensors and for generating a switch-off signal on the basis of the evaluation, wherein the evaluation unit checks, independent of a position of the movement element, the output signals of each of the plurality of sensors, to acquire a currently detected state vector, the currently detected state vector being one state vector from a set of state vectors which unambiguously comprise all possible combinations of the signals of all of the plurality of sensors, and generates the switch-off signal only when the currently detected state vector is one of one or more predetermined state vectors from the set of state vectors, wherein when an object is detected, the evaluation unit evaluates the currently detected state vector to distinguish whether the movement clement has been detected or the object with a risk of collision.