The authors wish to correct the following errors in the original paper Lay, V.; Effner, U.; Niederleithinger, E.; Arendt, J.; Hofmann, M.; Kudla, W. Ultrasonic Quality Assurance at Magnesia Shotcrete Sealing Structures. Sensors 2022, 22, 8717, https://doi.org/10.3390/s22228717.