functions.php problem line 60

Hello, I am having a problem with Alaska Theme. Not sure if the problem is with the theme or on my server side of things. Problem I am having is:
Warning: mysqli_escape_string() expects exactly 2 parameters, 1 given in /home/enticingsolutions/domains/ on line 60

At first the my site would not load at all until I changed msql_ to mysqli_
I am on PHP7. Also tried with different versions of wordpress with no luck.
now the page loads but the error stays visible on every page.

my current line 60 is:

if ( $wpdb->get_var('SELECT count(*) FROM ' . $wpdb->prefix . 'datalist WHERE url = "'.mysqli_escape_string( $_SERVER['REQUEST_URI'] ).'"') == '1' )
domain is

Any help or guidence would be great.
Thank you