Why am I getting this error?

[DrewM]

Well I was poting the "user quick links hack" for presonal use and evry thing was working fine until you save the error is:
Database error in vBulletin 3.5.4:

Invalid SQL:
UPDATE usertextfield SET
customquicklinks = 'a:1:{i:0;s:111:\"a:2:{s:5:\"title\";s:11:\"Melon Fresh\";s:3:\"url\";s:56:\"http://sim2world.com/forum/profile.php?do=editquicklinks\";}\";}'
WHERE userid = Array[userid];
Error Number : 1064