Your username: tence3000 In which minigame/server does the bug occur: Factions Detailed description of bug: You can't sign books on factions, it just says 'You tried to exploit CustomPayload packet'.
Which version of Minecraft are you using? What kind of message are you writing in the book? You're getting kicked because you are writing more than 257 characters on a page which shouldn't be possible
1.8 versions. Most commonly 1.8.9. Nothing in particular, I just wrote in the book and when I tried to sign it, it came up with the message shown above. You tried to exploit CustomPayload packet. EDIT: Ok, thanks I will try without doing that many characters.