Dispenser with a frame which comprises a dispensing mechanism with filling for the purpose of dispensing a predetermined quantity of the filling, wherein the dispenser further comprises a camera, a processor and a memory, wherein the camera can form an image of at least a portion of the filling, wherein a predetermined reference image is stored in the memory, and wherein the processor is provided for the purpose of determining a similarity between image and reference image, wherein the processor is further provided for the purpose of stopping the dispensing mechanism when said similarity lies below a predetermined value.