[Kwarde]

And don't forget that message.
Change

pawn Code:

if(afkmsg[playerid] != 0) return SendClientMessage(playerid, COLOR_NORMALRED, "( ! ) You can not chat while in AFK mode. Type /back to chat");

for

pawn Code:

if(afkmsg[playerid] != 0) return 0, SendClientMessage(playerid, COLOR_NORMALRED, "( ! ) You can not chat while in AFK mode. Type /back to chat");

Now it'll return 0 AND the message