The police have detained two people for showing black flag to Kanhaiya during his speech at Patna's SKM Hall.
Kanhaiya hails from Begusarai district of Bihar. He is on a two-day tour of his home state and met both Nitish Kumar and RJD president Lalu Prasad Yadav.
This is his first visit to Bihar after he was released from Delhi's Tihar Jail on bail.
Kanhaiya was arrested on sedition charges in connection with an event held at the JNU campus in March where anti-national slogans were allegedly raised