4.1.2 myisamchk chokes on a fulltext

[Mark Maggelet]

Hi.
I'm having this problem on 4.1.2, when I run myisamchk -o on my table I 
get a bunch of these lines:

Duplicate key  3 for record at   56134200 against new record at  244828223

then it segfaults.

key 3 is a fulltext. I tried the same thing on the same data with 4.0.14 
and it worked fine, I also tried dropping the fulltext and adding it 
again. myisamchk -e doesn't complain for some reason.

Any help very appreciated
/thanks