Project: Drupal Version: cvs Component: base system Category: bug reports Priority: critical Assigned to: chx Reported by: chx Updated by: chx Status: patch Attachment: http://drupal.org/files/issues/module_inc_no_default_nulls.patch (685 bytes) Try this: module_invoke('taxonomy', 'get_tree', 1); and compare the results with taxonomy_get_tree(1); What happens is that taxonomy_get_tree is called by the arguments 1, NULL, NULL, NULL which breaks it. Hence the patch. Every Drupal version I have met (4.4, 4.5, CVS) contains this error. I think this led module authors to not use module_invoke (at least I did so until now) which will be quite a problem if we decide on breaking up the modules into smaller pieces. chx -- View: http://drupal.org/node/17770 Edit: http://drupal.org/project/comments/add/17770