Limit for acess the Prestashop for Mysql?

[Protoman]

Hello Presto's,
Already happened when you do many refresh in your prestashop and he out of air?
is because that, in:
> Classes> MySQL.php, line 47.

    if ($this->_result = mysql_query($query.' LIMIT 1', $this->_link))

My question is:
disable this option is safe? ( 'LIMIT 0')
protect us exactly of what?