Stanley is recalling 2.6 million mugs sold in the U.S. after the company received dozens of consumer complaints, including some users who reported getting burned and requiring medical attention.

Stanley has received 91 reports of lids detaching worldwide, including 16 incidents in the U.S., resulting in 38 burn injuries globally and two in the U.S. Eleven consumers required medical attention.

Stanley, the drinkware brand that exploded in popularity on social media, issued a recall of roughly 2.6 million travel mugs over potential “burn hazards,” the Consumer Product Safety Consumer (CPSC) announced in a release Thursday.