Massachusetts cop nearly getting crushed by his own police cruiser that kept rolling when he jumped out to stop a fight.

The officer was seen jumping out of the cruiser as he arrived to break up a couple of vagrants slugging it out in Worcester last Thursday.

It almost immediately started rolling away — with the unidentified cop trying to open the door seconds after slamming it shut, just to realize it was locked.

The panicked-looking officer then got in front of the runaway car and tried to put the brakes on himself — putting himself in harm’s way as the cruiser kept rolling, pinning him against the back of a small black hatchback parked several feet away.