A biographer claims the Leaving Neverland filmmaker may have inadvertently damaged an alleged abuse victim's lawsuit against Michael Jackson's estate.

The HBO documentary sees James Safechuck and Wade Robson detail years of alleged abuse by Jackson when they were aged between seven and 14 years of age.

But after the dates of the abuse given in the documentary were challenged by biographer Mike Smallcombe, director Dan Reed claimed Safechuck's abuse may have gone on longer than depicted in the film – despite the alleged victim’s differing testimony.

(Image: Getty Images)

Smallcombe told The Mirror: “Reed has taken the astonishing step of changing Safechuck’s timeline himself, by now claiming Jackson continued to abuse him after the train station opened in 1994.

“In his lawsuit, Safechuck testifies that he only visited Neverland once after 1992, and that was in ‘late 1995 or early 1996’. By then, Safechuck would have been 18 years old.

“So by claiming Safechuck was ‘wrong’ in his lawsuit, Reed is effectively saying Safechuck perjured himself.”

Smallcombe says Safechuck and Wade Robson are appealing against the dismissal of their lawsuits in which they are seeking hundreds of millions of dollars from the Jackson Estate.

(Image: Channel 4)

The timeline being challenged revolves around the building of Neverland train station, as this is a place where abuse was alleged to have happened.

Safechuck claimed both in interviews and in his lawsuit against Jackson’s Estate that he was abused from 1988 until 1992, when he was 14.

Smallcombe has taken issue with Safechuck’s story of being abused at the train station, arguing it cannot be true as it was built two years after he said the assaults stopped.

(Image: Getty)

He shared construction permits on Twitter, showing that Neverland’s train station was approved on September 2, 1993, adding that it opened in 1994.

Reed continues to defend the film and the alleged victims, claiming on Twitter the date Safechuck has “wrong” is the end of the abuse.

He also denies that his commentary on the permits is tantamount to a u-turn.

In a statement, he said “Safechuck was present at Neverland both before and after the construction of the train station”.

(Image: Amos Pictures)

He said the documents did not clash with the claims made in the film, as sexual abuse is still alleged to have occurred after the construction of the station.

Writing on Twitter, he added: "Nope. No u-turn. No clash of dates. James was present at Neverland before and after the train station was built.

"In fact he took photos of the completed station which we included in the doc. And his sexual contact with Michael lasted into his teens. That’s all in the film."