The Olli is still perfectly safe to use with a damaged quick-release mechanism. The LATCH (UAS) connectors can be simply disengaged using the release button on each connector.
When removing the Olli booster seat from your vehicle, please ALWAYS apply negative pressure against the seat before pulling the quick-release strap. Simply pulling the quick-release strap without applying pressure against the seat may unfortunately cause the release mechanism to break.
A replacement Olli base can also be purchased by contacting Customer Support at 1-866-656-2462 or firstname.lastname@example.org.