Controversy surrounding the fast-growing gaming platform Roblox Corp.’s security measures, which critics say have made the site a haven for child predators, is starting to scare off investors.

Roblox’s stock dropped amid growing concerns over the lack of security measures to protect its large number of child users.

Roblox has long been the target of criticism for its security protocols. The controversy has also encouraged so-called vigilante users of the platform to seek out and expose child predators.