[NumbSkull]

set a pvar to to not show it like

pawn Код:

if(dialogid == DIALOG_AMMU&&GetPVarInt(playerid,"ammudialog")!=1)
    {
        SetPVarInt(playerid,"ammudialog",1);
        if (response == 1)
(rest of script)

then set a timer on cancel to reset/delete the pvar so they have time to get away and have time to wait if they want to get it again
cuz they are standing on the pickup so it keeps picking it up
or posably change pickup type to 19