yiisoft/yii2 · error · yii\base\InvalidConfigException

Connection::dsn cannot be empty.

Error message

Connection::dsn cannot be empty.

What it means

Error "Connection::dsn cannot be empty." thrown in yiisoft/yii2.

Source

Thrown at framework/db/Connection.php:626

     */
    public function open()
    {
        if ($this->pdo !== null) {
            return;
        }

        if (!empty($this->masters)) {
            $db = $this->getMaster();
            if ($db !== null) {
                $this->pdo = $db->pdo;
                return;
            }

            throw new InvalidConfigException('None of the master DB servers is available.');
        }

        if (empty($this->dsn)) {
            throw new InvalidConfigException('Connection::dsn cannot be empty.');
        }

        $token = 'Opening DB connection: ' . $this->dsn;
        $enableProfiling = $this->enableProfiling;
        try {
            if ($this->enableLogging) {
                Yii::info($token, __METHOD__);
            }

            if ($enableProfiling) {
                Yii::beginProfile($token, __METHOD__);
            }

            $this->pdo = $this->createPdoInstance();
            $this->initConnection();

            if ($enableProfiling) {
                Yii::endProfile($token, __METHOD__);

View on GitHub (pinned to 66f00d18a2)

When it happens

Trigger: Thrown at framework/db/Connection.php:626 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of yiisoft/yii2@66f00d18a2 (2026-08-17). Data as JSON: /api/errors/7a9f3241ae871477. Report an issue: GitHub.