Erratum to: A contrast among farmers’ ethnic groups: is this a social polarization tendency?Sitti Aida Adha Taridala, Nur Isiyana Wianti, Muhammad Arsyad and Arifiana Shima EkaputriE3S Web Conf., 52 (2018) 00055DOI: https://doi.org/10.1051/e3sconf/20185200055