A New Zealander has been injured after a bartender accidentally set fire to customers during a stunt at a cocktail bar in Croatia.

The incident happened at Boogie Jungle on Korcula Island, Croatia, on Tuesday night.

Four people received hospital treatment, including three Australians and the 23-year-old New Zealander.

The fire was reportedly due to a stunt with a flaming drink going wrong.

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Police are investigating the incident.