Yii2 call to a member function getDB() on null after update to the latest version

[alexjohnp]

Good morning,
after issuing a composer update, I run into this problem trying to authenticate to my application.
Login screen is ok. No authentication is possible (i.e. the problem arises after pressing the "login" button)

Error: Call to a member function getDb() on null in /var/www/html/gpl/vendor/dektrium/yii2-user/traits/ModuleTrait.php:28
Stack trace:
#0 /var/www/html/gpl/vendor/yiisoft/yii2/db/ActiveRecord.php(344): dektrium\user\models\User::getDb()
#1 /var/www/html/gpl/vendor/yiisoft/yii2/db/ActiveRecord.php(370): yii\db\ActiveRecord::getTableSchema()
#2 /var/www/html/gpl/vendor/yiisoft/yii2/db/ActiveRecord.php(177): yii\db\ActiveRecord::primaryKey()
#3 /var/www/html/gpl/vendor/yiisoft/yii2/db/BaseActiveRecord.php(107): yii\db\ActiveRecord::findByCondition(2)
#4 /var/www/html/gpl/vendor/dektrium/yii2-user/models/User.php(559): yii\db\BaseActiveRecord::findOne(2)
#5 /var/www/html/gpl/vendor/yiisoft/yii2/web/User.php(663): dektrium\user\models\User::findIdentity(2)
#6 /var/www/html/gpl/vendor/yiisoft/yii2/web/User.php(188): yii\web\User->renewAuthStatus()
#7 /var/www/html/gpl/vendor/yiisoft/yii2/web/User.php(333): yii\web\User->getIdentity()
#8 /var/www/html/gpl/vendor/yiisoft/yii2/base/Component.php(133): yii\web\User->getIsGuest()
#9 /var/www/html/gpl/vendor/yiisoft/yii2-debug/panels/UserPanel.php(81): yii\base\Component->__get('isGuest')
#10 /var/www/html/gpl/vendor/yiisoft/yii2/base/BaseObject.php(108): yii\debug\panels\UserPanel->init()
#11 [internal function]: yii\base\BaseObject->__construct(Array)
#12 /var/www/html/gpl/vendor/yiisoft/yii2/di/Container.php(381): ReflectionClass->newInstanceArgs(Array)
#13 /var/www/html/gpl/vendor/yiisoft/yii2/di/Container.php(156): yii\di\Container->build('yii\debug\panel...', Array, Array)
#14 /var/www/html/gpl/vendor/yiisoft/yii2/BaseYii.php(349): yii\di\Container->get('yii\debug\panel...', Array, Array)
#15 /var/www/html/gpl/vendor/yiisoft/yii2-debug/Module.php(177): yii\BaseYii::createObject(Array)
#16 /var/www/html/gpl/vendor/yiisoft/yii2-debug/Module.php(149): yii\debug\Module->initPanels()
#17 /var/www/html/gpl/vendor/yiisoft/yii2/base/BaseObject.php(108): yii\debug\Module->init()
#18 /var/www/html/gpl/vendor/yiisoft/yii2/base/Module.php(158): yii\base\BaseObject->__construct(Array)
#19 [internal function]: yii\base\Module->__construct('debug', Object(yii\web\Application), Array)
#20 /var/www/html/gpl/vendor/yiisoft/yii2/di/Container.php(375): ReflectionClass->newInstanceArgs(Array)
#21 /var/www/html/gpl/vendor/yiisoft/yii2/di/Container.php(156): yii\di\Container->build('yii\debug\Modul...', Array, Array)
#22 /var/www/html/gpl/vendor/yiisoft/yii2/BaseYii.php(349): yii\di\Container->get('yii\debug\Modul...', Array, Array)
#23 /var/www/html/gpl/vendor/yiisoft/yii2/base/Module.php(427): yii\BaseYii::createObject(Array, Array)
#24 /var/www/html/gpl/vendor/yiisoft/yii2/base/Application.php(315): yii\base\Module->getModule('debug')
#25 /var/www/html/gpl/vendor/yiisoft/yii2/web/Application.php(69): yii\base\Application->bootstrap()
#26 /var/www/html/gpl/vendor/yiisoft/yii2/base/Application.php(273): yii\web\Application->bootstrap()
#27 /var/www/html/gpl/vendor/yiisoft/yii2/base/BaseObject.php(108): yii\base\Application->init()
#28 /var/www/html/gpl/vendor/yiisoft/yii2/base/Application.php(206): yii\base\BaseObject->__construct(Array)
#29 /var/www/html/gpl/web/index.php(12): yii\base\Application->__construct(Array)
#30 {main}

What steps will reproduce the problem?

run composer update

What is the expected result?

user can access the application

What do you get instead?

call to a member function getDB on null

Additional info

Q	A
Yii version	2.0.13.1
PHP version	7.0.22
Operating system	Ubuntu 16.04 LTS

[samdark]

Seems it's an issue in updated version of an extension.

[schmunk42]

Check the config of your database component db and user module user - https://github.com/dektrium/yii2-user/blob/master/traits/ModuleTrait.php#L28