Excel export, description field

[Majun]

Hello,

Testing 1.2.0rc1, I tried to add the "description" column in excel exported columns.

This creates the following error :
"Fatal error: Cannot use object of type BugData as array in .../www/mantis/excel_xml_export.php on line 86"

Can someone help me out ?
I need this export field. Summary field is not enough.
Should I report a bug ?

Majun