Database is locked. Unable to fetch row in "DETACH DATABASE..."

[mkolenda]

In my restless dreams I see this code:

bool DatabaseManager::saveEncryptedDatabase(const QString &path, const QString &password)
{
    QSqlQuery q;

    q.exec(QString("ATTACH DATABASE '%1' AS encrypted KEY '%2'").arg(path, password));
    Utils::handleSqlError(q);
    q.exec(QString("SELECT sqlcipher_export('encrypted')"));
    Utils::handleSqlError(q);
    q.exec("DETACH DATABASE encrypted");
    Utils::handleSqlError(q);
    return true;
}

Where Utils::handleSqlError is printing error if any occured.
Result:

"SQL Query Error: database encrypted is locked Unable to fetch row in\nDETACH DATABASE encrypted"

I have even delayed it to timer and tried to detach every 250ms. No luck. I've tried with transactions. Still nothing though.
I've got dandruff on my head.