Glossary

My autolinks to the glossary doesnt work. "mod/glossary/showentry.php?courseid=2&concept=Navigate",

I get the following warning:

Warning: Invalid argument supplied for foreach() in

/var/www/moodle/mod/glossary/showentry.php on line 24

Ive checked all the configuration and its OK. 

Im working with moodle 1.4.4+ (mysql & linux). The exact combination works correctly in other server.

Does anyone have a clue.

Greetings

Oscar.