The Imam of our time is Imam Al-Mahdi (AS) who is the twelfth and last of the Twelve Imams from Ahlul Bayt (AS) wig are the real successors of the Prophet Muhammad (SAWA). As all the prophets are Infallible, all the Twelve Imams are Infallible. This infallibility never came overnight but it is with them since the beginning of their lives till the end. You can not compare us with any Infallible Imam. Allah (SWT) Selected and Appointed the Infallible Imams and no one from the whole Umma can be compared with them.
Wassalam.