Error in Search Builder using Contribution Note

Bug reported on forum: http://forum.civicrm.org/index.php/topic,2548.0/topicseen.html

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When I try to search using the Search Builder on Contribution -> Contribution Note, I get the following error:

Code:

[debug_info] => SELECT DISTINCT UPPER(LEFT(contact_a.sort_name, 1)) as sort_name FROM civicrm_contact contact_a LEFT JOIN civicrm_contribution ON civicrm_contribution.contact_id = contact_a.id WHERE ( ( LOWER( ) LIKE '' ) ) AND ( 1 ) [nativecode=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 ') LIKE '' ) ) AND ( 1 )' at line 1]
[type] => DB_Error
[user_info] => SELECT DISTINCT UPPER(LEFT(contact_a.sort_name, 1)) as sort_name FROM civicrm_contact contact_a LEFT JOIN civicrm_contribution ON civicrm_contribution.contact_id = contact_a.id WHERE ( ( LOWER( ) LIKE '' ) ) AND ( 1 ) [nativecode=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 ') LIKE '' ) ) AND ( 1 )' at line 1]
[to_string] => [db_error: message="DB Error: syntax error" code=-2 mode=callback callback=CRM_Core_Error::handle prefix="" info="SELECT DISTINCT UPPER(LEFT(contact_a.sort_name, 1)) as sort_name FROM civicrm_contact contact_a LEFT JOIN civicrm_contribution ON civicrm_contribution.contact_id = contact_a.id WHERE ( ( LOWER( ) LIKE '' ) ) AND ( 1 ) [nativecode=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 ') LIKE '' ) ) AND ( 1 )' at line 1]"]