Feeds Tamper does not work from PHP CLI

Where are some Feeds importers with Feeds Tamper, all works fine if run from /import admin page in browser.

But i have to run ’em at a particular time, so i’m trying this PHP CLI script:

[drupal bootstraping]
$feedSource = feeds_source('importer_id');
while (FEEDS_BATCH_COMPLETE != $feedSource->import());

In this case feed import is performed without tamper’s translations.

Log errors smth like:

Undefined index: 'tamper_plugin_id' in feeds_tamper_load_by_importer()

Is there any way to invoke tampers manually?

P. S.
Active ussue.

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/22/feed