Stephen Fry, star of The Hobbit and Blackadder, has been rushed to hospital after falling 2m off a stage in London.
He was delivering a keynote speech about the perils of AI when it happened.
The Daily Mail said Fry had finished his speech and was walking off stage when the accident happened at London's O2 Arena.
He was taken to hospital with rib and leg injuries that needed treatment.
It is believed the accident happened last Thursday when Fry was giving the speech at CogX but details of it have only emerged overnight.
Organisers of the CogX event have announced an investigation will be held into what happened.
Meanwhile, portions of Fry's speech have also been revealed in which he claimed AI stole his voice after analysing his narration of the Harry Potter books.
"I'm a proud member of [actors' union SAG-AFTRA]. As you know, we've been on strike for three months now. And one of the burning issues is AI," the 66-year-old said on stage and went on to play a clip of what appeared to be his voice narrating a historical documentary.
"I said not one word of that - it was a machine. Yes, it shocked me.
"They used my reading of the seven volumes of the Harry Potter books, and from that dataset an AI of my voice was created, and it made that new narration."
Fry said it left him deeply concerned that "it won't be long until full deepfake videos are just as convincing" and the growing technology could pretend to have him "read anything from a call to storm Parliament to hard porn".
"What you just heard was done without my knowledge," he said.
"So I heard about this, I sent it to my agents on both sides of the Atlantic, and they went ballistic - they had no idea such a thing was possible."
