[Jakku]

pawn Код:

//Above Ongamemodeinit:
new ChatDisabled;


public OnGameModeInit()
{
ChatDisabled = 0; //Chat enabled
return 1;
}

            else if(strcmp(cmd, "/chat", true) == 0) {
        if (ChatDisabled == 0) {
        ChatDisabled = 1; //Chat off
        return 1;
        }
        if (ChatDisabled == 1) {
        ChatDisabled = 0; //Chat on
        return 1;
        }
        return 1;
        }

public OnPlayerText(playerid, text[])
{
    if(ChatDisabled == 1)
{
   SendClientMessage(playerid, COLOR_YOURCOLOR, "The chat is currently disabled by an admin.");
   return 0;
}
return 1;
}

Try this