Seems that this is the offending script:

CREATE TABLE scart (
scartid int(11) NOT NULL auto_increment,
customers_id int(11) NOT NULL default '0',
dateadded varchar(8) NOT NULL default '',
datemodified varchar(8) NOT NULL default '',
PRIMARY KEY (scartid),
UNIQUE KEY customers_id (customers_id),
UNIQUE KEY scartid (scartid)
) TYPE=MyISAM;