How to fix the «Missed phrase» exception on running the «bin/magento i18n:collect-phrases» command?

dmitrii_fediuk · November 10, 2016, 9:55pm

It looks like a bug in Magento 2 core.
It is reproduced when the core tries to translate an empty string (in a way like this: __('')) from a third-party extension (or a design theme).

github.com

magento/magento2/blob/2.1.2/setup/src/Magento/Setup/Module/I18n/Dictionary/Phrase.php#L80-L93


/**
 * Set phrase
 *
 * @param string $phrase
 * @return void
 * @throws \DomainException
 */
public function setPhrase($phrase)
{
    if (!$phrase) {
        throw new \DomainException('Missed phrase');
    }
    $this->_phrase = $phrase;
}

It is not reproduced if a system contains only the core Magento 2 modules.
It is not reproduced if a system contains only the core Magento 2 modules and Mage2.PRO extensions:

So it is a bug in the core, but in is caused by a third-party extension.
I recommend to look the installed third-part extensions (and design themes) source code for the empty translation expressions like __('').