Thread:Extension talk:UserMerge/Duplicate entry

We are having a pretty big issue as this extension stopped working. We are currently getting an error "1062: Duplicate entry" when trying to merge *anything* (at least that's what it looks like).


 * A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
 * from within function "UserMerge::mergeUser". Database returned error "1062: Duplicate entry 'XXXXXXXXXX-43742-0-0' for key 'ipb_address' (localhost)".
 * from within function "UserMerge::mergeUser". Database returned error "1062: Duplicate entry 'XXXXXXXXXX-43742-0-0' for key 'ipb_address' (localhost)".

So it's trying to set an ID that's already in-use. Manually inspecting the database shows that indeed both IDs are still in-use. Any clue on why the previous row was not deleted (I am assuming that's what should have been done)? More importantly, why did it not error out when the deletion fail?

Box: MediaWiki             1.21.3 PHP                   5.4.17 (apache2handler) MySQL                 5.5.32 User Merge and Delete 1.8.1 (4fd1c08)

Any suggestions?