[Konstantinos]

That's why there is "response" parameter. If response is 0, then the player either clicked on second button or pressed ESC. If you want the code to be executed only when a player clicked the first button or pressed Enter:

pawn Код:

Dialog:fishtools(playerid, response, listitem, inputtext[])
{
    if (response)
    {
        // code..
    }
    return 1;
}