Merge Thread Problem

[Dingo14]

Wondering if anyone can help I get this message when I try to merge two threads, I can merge posts just fine

PHP Code:

Database error in vBulletin 3.7.0:

Invalid SQL:
insert into thread_bumps (threadid, bump) values (43556, 1236909500);

MySQL Error   : Duplicate entry '43556' for key 1
Error Number  : 1062
Request Date  : Thursday, March 12th 2009 @ 09:58:20 PM
Error Date    : Thursday, March 12th 2009 @ 09:58:20 PM
Script        : http://******/forum/inlinemod.php?do=domergethreads&threadids=43556,41088
Referrer      : http://********/forum/inlinemod.php?forumid=33
IP Address    : *********
Username      : *******
Classname     : vB_Database_MySQLi
MySQL Version : 5.0.67-community 

[Marco van Herwaarden]

thread_bumps is not a default vB table, but probably belongs to a modification you have installed. Please contact the author for a solution.

PS 3.7.0 is really outdated and a few security updates have been relreased since. I stronglyu suggest to upgrade.