A Database Error Occurred

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Top/Society/Philosophy/Philosophers/H/Holbach,_Paul_Henri_Thiry_d''' at line 1

select catid from structure where topic = 'Top/Society/Philosophy/Philosophers/H/Holbach,_Paul_Henri_Thiry_d''