Error in MySQL Syntax when merging contacts

I opened the "Find and Merge Duplicate Contacts" window from the administration page. I used the fuzzy rule with individuals. It found four duplicate contacts, each one had a similar contact with only an e-mail address and name in the duplicate. When I clicked merge for each one I got the following dump:

Sorry. A non-recoverable error has occurred.
DB Error: syntax error

Database Error Code: 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 ')' at line 8, 1064

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Error Details:

Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => handle
)

[code] => -2
[message] => DB Error: syntax error
[mode] => 16
[debug_info] =>
DELETE g
FROM civicrm_group_contact_cache g
INNER JOIN civicrm_contact c ON c.id = g.contact_id
WHERE g.group_id IN (
SELECT id
FROM civicrm_group
WHERE TIMESTAMPDIFF(MINUTE, cache_date, NOW()) >
)
[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 ')' at line 8]
[type] => DB_Error
[user_info] =>
DELETE g
FROM civicrm_group_contact_cache g
INNER JOIN civicrm_contact c ON c.id = g.contact_id
WHERE g.group_id IN (
SELECT id
FROM civicrm_group
WHERE TIMESTAMPDIFF(MINUTE, cache_date, NOW()) >
)
[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 ')' at line 8]
[to_string] => [db_error: message="DB Error: syntax error" code=-2 mode=callback callback=CRM_Core_Error::handle prefix="" info="
DELETE g
FROM civicrm_group_contact_cache g
INNER JOIN civicrm_contact c ON c.id = g.contact_id
WHERE g.group_id IN (
SELECT id
FROM civicrm_group
WHERE TIMESTAMPDIFF(MINUTE, cache_date, NOW()) >
)
[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 ')' at line 8]"]
)