Chris Brown calls himself "Christopher" when he's scared ... at least judging by the 911 call that was placed moments after the singer totaled his Porsche in a paparazzi chase last month.
Minutes after the February 9 crash, a witness called 911 ... and told the operator Brown's car had smashed into a wall in an alley in Beverly Hills.
The operator asked to speak with Brown (who identified himself as "Christopher") ... and the singer explained how the paparazzi had been chasing him in another vehicle ... and dangerously cut him off.
Brown says the paparazzi "blocked me off and stopped so I had to swerve" ... causing him to lose control and crash.
Brown says he was not injured in the accident ... but claims the paparazzi responsible for the incident fled the scene before emergency responders arrived.
As for the police investigation into the accident -- law enforcement tells us, it's case closed ... cops couldn't prove the paps were involved.