Error in content_node_field_instance query when adding a new TEXT field

I'm getting this error when trying to add a new TEXT field:

user warning: Field 'description' doesn't have a default value query: drupal_write_record /* drupal : drupal_write_record */ INSERT INTO content_node_field_instance (field_name, type_name, weight, label, widget_type, widget_settings, display_settings, widget_module) VALUES ('field_test_string', 'test_hidden', 0, 'field_test_string', 'text_textfield', 'a:1:{s:4:\"rows\";s:0:\"\";}', 'a:5:{s:5:\"label\";a:1:{s:6:\"format\";s:5:\"above\";}s:6:\"teaser\";a:1:{s:6:\"format\";s:7:\"default\";}s:4:\"full\";a:1:{s:6:\"format\";s:7:\"default\";}i:0;a:1:{s:6:\"format\";s:5:\"above\";}i:1;a:1:{s:6:\"format\";s:7:\"default\";}}', 'text') in D:\net\BlackTea_6.0\includes\common.inc on line 3295.

This is happening when I click the submit button on the "Create New Form" form.

My guess would be that this is coming from content_crud.inc:386, where the $field variable doesn't have a 'description' defined. According to the schema, the description field cannot be NULL and has no DEFAULT defined.