The former Edo State governor escaped being hit by hoodlums as they threw stones at him.
The programme, which commenced officially immediately after President Buhari arrived at the MKO Abiola International Stadium, Kuto, Abeokuta, was paused for some minutes following the violence.
Violence erupted when Oshiomhole was invited to the podium for his speech.
As he began to speak, persons suspected to be hoodlums started throwing stones at him and one of the stones flew in the direction where President Muhammadu was sitting.
He was saved by one of the security operatives who took the hit for the President.
The development angered the leaders of the party, including former Governor of Lagos State, Bola Tinubu, who left the podium while the President was making his remarks.