An agricultural working machine, in particular a self-propelled harvesting machine or towing vehicle, wherein a driver assistance system is provided, which has a memory for storing data, a computer device for processing the data stored in the memory and a notification unit, wherein the notification unit has a display control unit and a user display, wherein the computer device is configured to communicate notification data comprising user information which is critical to safety for display in a prespecified region of the user display to the display control unit, wherein the display control unit is configured to determine, in a notification routine, image data from the notification data, wherein the notification unit is configured to display the image data on the user display and wherein the notification unit is configured to display a portion of the image data in the prespecified region, characterized in that the display control unit is configured to determine, in the notification routine, a first check value from the portion of the image data, in that the display control unit is configured to communicate the first check value to the computer device, in that the computer device is configured to determine, in a check routine, a second check value on the basis of the user information which is critical to safety, in that the computer device is configured to compare, in the check routine, the first check value and the second check value and thus to determine whether the information which is critical to safety is represented in the image data and in that the computer device is configured to execute an emergency routine if the information which is critical to safety is not represented in the image data. wherein a driver assistance system is provided, which has a memory for storing data, a computer device for processing the data stored in the memory and a notification unit, wherein the notification unit has a display control unit and a user display, wherein the computer device is configured to communicate notification data comprising user information which is critical to safety for display in a prespecified region of the user display to the display control unit, wherein the display control unit is configured to determine, in a notification routine, image data from the notification data, wherein the notification unit is configured to display the image data on the user display and wherein the notification unit is configured to display a portion of the image data in the prespecified region, characterized in that the display control unit is configured to determine, in the notification routine, a first check value from the portion of the image data, in that the display control unit is configured to communicate the first check value to the computer device, in that the computer device is configured to determine, in a check routine, a second check value on the basis of the user information which is critical to safety, in that the computer device is configured to compare, in the check routine, the first check value and the second check value and thus to determine whether the information which is critical to safety is represented in the image data and in that the computer device is configured to execute an emergency routine if the information which is critical to safety is not represented in the image data.