A dirt bike race in Argentina caused quite the calamity … a stuck bike resulted in multiple collisions during the competition — though organizers say riders only sustained minor injuries.

Video shows how the crash at Enduro del Invierno in Mar del Plata, Argentina went down … beginning after one moto rider got himself and his bike stuck in beach sand — and he frantically waves to keep other racers from plowing into him.

A few bikers just barely miss the competitor … before one runs right through rider and bike alike.

All hell breaks loose after the first crash … with a second racer slamming into the mess a moment later, and a third flying through the air and smashing into the pile of motorcycles.

One biker rolls down a small embankment and lies completely still for what feels like ages — but ultimately all the riders managed to scramble away from the wreckage.

Despite how serious the crash appears on video … organizers of the weekend event claim the riders only sustained relatively minor injuries — a broken collarbone and fractured foot being the worst of them. One rider was knocked unconscious, though he’s apparently just fine now.