An access control device for controlling an access of a plurality of persons of a group of persons to an access area, comprising: a device for providing a plurality of biometric features of a plurality of persons of a group of persons , wherein each person is assigned a biometric feature, wherein the device comprises: a person counting device , which is configured to determine a number of persons in the group of persons in order to obtain a first number of persons; and a detection device , which is configured to detect the plurality of biometric features, to compare at least two biometric features of the plurality of biometric features, to determine a number of different biometric features in the plurality of biometric features in order to obtain a second number of persons, and to provide the plurality of biometric features for further processing, if the first number of persons matches the second number of persons; the access control device further comprising: an access gate , which comprises an entry door and an exit door ; wherein the person counting device is configured to determine the number of persons in the group of persons between the entry door and the exit door ; wherein the detection device is configured to detect the plurality of persons between the entry door and the exit door , and, in response to the detection of the plurality of persons between the entry door and the exit door , to detect the plurality of biometric features; and characterized in that the access control device comprises a signal transmitter , which is configured to emit a signal, in particular an acoustic signal or a visual signal, in direction of the group of persons , if the first number of persons does not match the second number of persons. a person counting device , which is configured to determine a number of persons in the group of persons in order to obtain a first number of persons; and a detection device , which is configured to detect the plurality of biometric features, to compare at least two biometric features of the plurality of biometric features, to determine a number of different biometric features in the plurality of biometric features in order to obtain a second number of persons, and to provide the plurality of biometric features for further processing, if the first number of persons matches the second number of persons; the access control device further comprising: an access gate , which comprises an entry door and an exit door ; wherein the person counting device is configured to determine the number of persons in the group of persons between the entry door and the exit door ; wherein the detection device is configured to detect the plurality of persons between the entry door and the exit door , and, in response to the detection of the plurality of persons between the entry door and the exit door , to detect the plurality of biometric features; and characterized in that the access control device comprises a signal transmitter , which is configured to emit a signal, in particular an acoustic signal or a visual signal, in direction of the group of persons , if the first number of persons does not match the second number of persons. an access gate , which comprises an entry door and an exit door ; wherein the person counting device is configured to determine the number of persons in the group of persons between the entry door and the exit door ; wherein the detection device is configured to detect the plurality of persons between the entry door and the exit door , and, in response to the detection of the plurality of persons between the entry door and the exit door , to detect the plurality of biometric features; and characterized in that the access control device comprises a signal transmitter , which is configured to emit a signal, in particular an acoustic signal or a visual signal, in direction of the group of persons , if the first number of persons does not match the second number of persons. <EOS>