If KRNL-Injector failed to find the Roblox process, delete KRNL App data and see. If that doesn't help follow the solutions mentioned in this post to resolve the issue.

A chat-based Roblox exploit appears to be causing players to lose account access after joining specific games. Multiple members of the Roblox community report falling victim to the exploits, with ...

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.