[support] What's causing these errors from the date module?

[Chris G]

When I run update.php on my Drupal 6.22 site I get the following errors:-

    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 24.
    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 25.
    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 26.
    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 28.
    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 29.
    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 30.
    * warning: Attempt to modify property of non-object in
/var/sites/g/globaloptimists.org/public_html/modules/date/includes/date_plugin_display_attachment.inc
on line 31.


What do I need to do to fix it?  It doesn't actually seem to break
anything at the moment.

-- 
Chris Green