How to fix «Call to a member function getNext() on null in generated/code/Magento/User/Model/User/Interceptor.php»?

dmitry_fedyuk · December 14, 2018, 6:47pm

Locate the code block in the \Magento\Backend\Model\Locale\Manager::getUserInterfaceLocale() method:

magento/magento2/blob/2.2.5/app/code/Magento/Backend/Model/Locale/Manager.php#L96-L100


if ($userData && $userData->getInterfaceLocale()) {
    $interfaceLocale = $userData->getInterfaceLocale();
} elseif ($this->getGeneralLocale()) {
    $interfaceLocale = $this->getGeneralLocale();
}

Add the following code above:

if ($userData) {
	$userData->___init();
}