I try to import products in multiple languages with commerce_feeds module, but when i press "Import", i see a lot of error messages like:
SQLSTATE[22P02]: Invalid text representation: 7 ERROR: invalid input syntax for integer: "" LINE 4: ...(entity_type = 'commerce_product') AND (entity_id IN ('')) ^

faulty query is
SELECT et.* FROM entity_translation et WHERE (entity_type = 'commerce_product') AND (entity_id IN ('')) ORDER BY entity_id ASC, created ASC
ERROR: invalid input syntax for integer: "" at character 103

trouble is in translation.handler.inc, line 209:

    $results = db_select('entity_translation', 'et')
      ->fields('et')
      ->condition('entity_type', $entity_type)
      ->condition('entity_id', array_keys($entities), 'IN')
      ->orderBy('entity_id')
      ->orderBy('created')
      ->execute();

I'm not so familiar with postgresql (i use 9.1.2), but i think we must provide any value for expression IN or delete empty key (when i place unset($entities['']); before $result = ..., import is ok).

Also, if this is commerce_feeds problem, prease tell me, i'll close this issue and reopen issue in commerce_feeds.