Entity reference for feed imports not working on some referenced nodes

I am using "Entity Reference" version 7.x-1.1, I have a user reference field in the content type.
If I am running multiple feed importers programatically using following code -

foreach ($importers as $key => $value) {
  //feeds_batch_set(t('Importing'), 'import', 'yale_courses_importer', $value->nid);
  while (FEEDS_BATCH_COMPLETE != feeds_source('yale_courses_importer', $value->nid)->import());
}

I am matching the reference by entity label.
If the user reference is not present I get these two warnings.

Warning: array_keys() expects parameter 1 to be array, boolean given in entityreference_feeds_set_target() (line 129 of /var/www/html/sites/all/modules/contrib/entityreference/entityreference.feeds.inc).
Warning: reset() expects parameter 1 to be array, null given in entityreference_feeds_set_target() (line 131 of /var/www/html/sites/all/modules/contrib/entityreference/entityreference.feeds.inc).

I do not get this error in following cases -

1. User reference is present.
2. Source user reference field is empty.
3. If I run the importer individually by clicking on feeds import button.

Not sure where should this issue go, to feeds or to entity reference.

I'm getting this also. Though I do sometimes do funny things with entity lookups and tampers, tracing this notice shows that it's just native behaviour coming from entityreference_feeds_set_target()

Basically, even if the search for the entity done at
$options = $handler->getReferencableEntities($value, '=');
returns an empty array (no results, which is usually legal)
the later code there assumes there is at least one result always, and resets and manipulates the array as if it had something in it.
We still end up with the system, returning no match, but only after triggering these warnings.

Checking for empty will probably help here, like:

        case 'label':
          $options = $handler->getReferencableEntities($value, '=');
          if (!empty($options)) {
            $options = reset($options);
            $etids = array_keys($options);
            // Use the first matching entity.
            $entity_id = reset($etids);
          }
          break;

( this is probably not the right issue for the PHP notice warning though. I'm getting it when the referenced entity just don't exist)

I am also experiencing this issue. Let me know if I can give any additional information to fix this. :)

Shifting to #2722671: Warning when feed refers to non-existing target: array_keys() expects parameter 1 to be array, boolean given in entityreference_feeds_set_target() (line 129) because the warning is unrelated to the reported issue "feed imports not working". The warning is just a later symptom that happens after the "not working" problem happens, and the warning can be triggered just by failed lookups on a working site.

duplicate of #1943300: array_keys() and reset() notices in entityreference_feeds_set_target() during feed import if entity doesn't exist and #2722671: Warning when feed refers to non-existing target: array_keys() expects parameter 1 to be array, boolean given in entityreference_feeds_set_target() (line 129)