The bolometric light curve of SN 2018ibb from 1800 to 14 300 Å (rest-frame) and light-curve fits to the fading light curve using the Katz et al. (2013) method. The entire fading light curve from up to 706 days after peak is fully consistent by being powered 24–35 M_⊙ of ⁵⁶Ni (dark red), suggesting that SN 2018ibb could be a pair-instability supernova. At about 300 days after peak (i.e. ≳400 days after the explosion), the γ-ray trapping decreases with time. The loss of trapping is indicated by the difference between the light-red (100% trapping) and dark-red (< 100% trapping) curves.