Storage 'engine' isn't necessarily 'sql' but addressfield_field_views_data() uses it hardcoded

In addressfield_field_views_data() the 'sql' storage is used to find tables and columns. It's not always 'sql'. (With field_sql_norevisions you can skip all revisions tables.) Very easy to check which storage is used for this field.

Change

  foreach ($field['storage']['details']['sql'] as $type => $tables) {

to

  $key = key($field['storage']['details']);
  foreach ($field['storage']['details'][$key] as $type => $tables) {

and that's it. No notices and correct views data.