A coroner has made a number of similar accidents after an 11-year-old boy fell to his death from a zipwire in Gwynedd two years ago.
An inquest jury in Dolgellau concluded that Bailey Sumner's death was an accident.
He died after falling from the SwampFlyer ride at Greenwood Forest Park in 2011.
Lorna Prichard reports.
The inquest into the death of a boy from Blackpool who fell from a zip wire at a Gwynedd adventure park has returned a verdict of accidental death.
Bailey Sumner, 11, died after falling from the SwampFlyer ride at Greenwood Forest Park, near Caernarfon, on Easter Sunday in 2011.
Read: Inquest hears boy was 'wrongly attached' to zip wire
An 11-year-old boy who died after falling from a zip wire at a Gwynedd adventure park had been wrongly attached to the ride, an inquest has heard.
Bailey Sumner from Blackpool died when he fell from the 475-ft long SwampFlyer ride at the Greenwood Forest Park in April 2011.
The ride had opened just a week before, after passing a safety inspection.
The inquest at Dolgellau heard a carabiner clip was connected to a "false loop" in the safety attachment.
The hearing, which is due to last three days, continues.