Problem merging multiple tickets


I'm using RT 3.2.2 with fastCGI and MySQL 4.0.20. It's running Ok, but 

when i try to merge multiple tickets at once i got an error. I just
searching for tickets with the same Requestor and then i click on the
option “Update multiple tickets”, after that i unselect the first ticket
and put its number on “Merge into” field and click “Update All” button
that’s when I got this error and everything else is working just fine:

error: Can’t call method “Name” without a package or object reference at
/opt/rt3/lib/RT/Interface/ line 1173.

context: …
1169: push ( @results, $msg );
1170: }
1171: }
1172: else {
1173: push ( @results, "User asked for an unknown update type for custom
field " . $cf->Name . " for ticket " . $Ticket->id );
1174: }
1175: }
1176: }
1177: return (@results);

code stack: /opt/rt3/lib/RT/Interface/

raw error

Any help?