Nefarious game makers appear to be leveraging a chat-based Roblox exploit that results in automatic account bans for unsuspecting users.

Roblox is implementing fixes for a chat moderation exploit that resulted in a wave of automatic bans, but the offenders say there’s more to come.

Roblox, one of the world’s most popular online gaming platforms, has built its reputation as a place where millions of players—especially children—can socialize and create their own virtual worlds.