--- profile.module	2008-02-24 02:05:05.000000000 +0100
+++ profile.module.patch	2008-02-24 02:05:35.000000000 +0100
@@ -148,7 +148,7 @@
     $fields['user_profile'] = t('Link to full user profile');
     $form['profile_block_author_fields'] = array('#type' => 'checkboxes',
       '#title' => t('Profile fields to display'),
-      '#default_value' => variable_get('profile_block_author_fields', NULL),
+      '#default_value' => variable_get('profile_block_author_fields', array()),
       '#options' => $fields,
       '#description' => t('Select which profile fields you wish to display in the block. Only fields designated as public in the <a href="@profile-admin">profile field configuration</a> are available.', array('@profile-admin' => url('admin/user/profile'))),
     );