How do I make this npc stop in front of the target, not into it?

I have this that makes the npc walk to another npc but it just walks into it, it should walk to it but stop when it's 4 studs close to it how do I do this??

while wait() do
    local distances = {}
    local charwithdistance = {}
    for number,char in pairs (game.Workspace.NPCs:GetChildren()) do
        local distance = (char.Head.Position - script.Parent.Head.Position).magnitude
        distances[number] = distance
        charwithdistance[distance] = char
    end
    table.sort(distances)
    for number2, plr in pairs (distances) do
        local closestdistance = plr
        local closestplayer = charwithdistance[(closestdistance)]
        if closestplayer.Owner.Value ~= script.Parent.Owner.Value then
            script.Parent.Humanoid:MoveTo(closestplayer.Head.Position)
            break
        end
    end
end

I tryed doing this but it just broke the npc...

while wait() do
    local distances = {}
    local charwithdistance = {}
    for number,char in pairs (game.Workspace.NPCs:GetChildren()) do
        local distance = (char.Head.Position - script.Parent.Head.Position).magnitude
        distances[number] = distance
        charwithdistance[distance] = char
    end
    table.sort(distances)
    for number2, plr in pairs (distances) do
        local closestdistance = plr
        local closestplayer = charwithdistance[(closestdistance)]
        if closestplayer.Owner.Value ~= script.Parent.Owner.Value and closestdistance > script.Parent.GunStats.Range.Value then
            script.Parent.Humanoid:MoveTo(CFrame.new(script.Parent.Head.Position, closestplayer.Head.Position) * CFrame.new(0,0, -25))
            break
        end
    end
end