Kansas City, Mo. ? A man who has been the Kansas City Chiefs’ mascot for more than two decades was in stable condition after being seriously injured this weekend while rehearsing a zip line routine at Arrowhead Stadium. His attorney said Tuesday his injuries appear to be caused by human error.

Dan Meers, 46, who has played the KC Wolf since the mascot’s inception in 1989, was seriously injured Saturday while practicing for Sunday’s game against the San Diego Chargers. No description of Meers’ specific injuries was available, but a longtime friend said Meers suffered a serious back injury.

“The injuries appear to be related to the manner in which a third-party company secured the riggings,” his attorney, Tim Dollar, said. “However, an investigation is pending.”

Kansas City Chiefs spokesman Ted Crews acknowledged Meers’ injury but declined to give details about the accident or his condition.

While Meers doesn’t perform the zip line routine every game, Dollar said, he was scheduled to do a slight variation of an entrance he’d done earlier this season.

Being the mascot is a full-time job that involves making community appearances on a daily basis, Dollar said.

Meers, who is married and has three children, is part of a close-knit church community that’s helping the family, Dollar said.

“They recognize the need to preserve evidence so that it can be investigated and prevent this thing from happening again,” Dollar said. “Therefore it was necessary to hire counsel to take over that role while they attend to Dan.”

Meers is listed as an executive committee member of the Newark, Del.-based Mascot Hall of Fame. According to its website, Meers previously performed as Fredbird, the St. Louis Cardinals’ mascot, and the University of Missouri’s mascot Truman the Tiger.

Rod Handley, a Lee’s Summit minister who’s known Meers for 24 years, says Meers is an “unbelievable guy” and is a board member for Handley’s ministry, Character That Counts.

“Dan is one of the greatest guys on the Earth,” Handley said. “He has a beaming smile always on his face. He’s one unbelievable guy.”