The future of personal transportation is in hot water after the U.S. Consumer Product Safety Commission (CPSC) issued a recall of 501,000 hoverboards on Wednesday. The recall comes amid concerns the hoverboards pose a fire risk stemming from overheating lithium-ion battery packs. At least 99 incidents of burn injuries and property damage has been reported.

The CPSC offers a full breakdown of the hoverboards affected by the recall, which includes models sold by Razor, Swagway, and Hoverboard LLC. Consumers are urged to stop using the products immediately and contact the recalling company for a refund, repair or replacement; hoverboards sold between June 2015 and May 2016 from retailers such as Overstock.com are among those most at risk for catching fire.

According to CPSC Chairman Elliot F. Kaye, the commission has investigated more than 60 hoverboard fires in more than 20 states, resulting in over $2 million in property damage.

"Let me be clear about this: All of the hoverboard models included in this recall were made with fundamental design flaws that put people are risk," Kaye said. "They were made and sold without a safety standard in place."

This isn't the first time hoverboards have sparked controversy. Earlier this year, Amazon agreed to offer full refunds to anyone who purchased a hoverboard from the online retailer due to—you guessed it—fire concerns. If you own a hoverboard that was purchased from one of the affected manufacturers, it's probably a good idea to find some other way to get around—at least until these rideables stop catching fire.