Evenflo is recalling nearly 30,000 combination booster seats because children can loosen the harness without an adult’s knowledge.

The recall covers certain Evolve 3-in-1 seats. Reports say that if the harness is loose, it could increase the risk of injury in a crash.

The company says models 34411700 and 34411741 are included in the U.S. recall. All recalled chairs were manufactured before Feb. 9, 2016

Evenflo officials said there have been no reports of injuries, but the company has received 27 complaints that children have been able to loosen the harnesses.

The Miamisburg, Ohio, company will notify registered owners and provide a remedy kit with a replacement harness adjustment button at no cost.

The recall is expected to start on Sept. 26.