Debug и release

The program has unexpectedly finished.
The process was ended forcefully.
D:/build-example-Desktop_Qt_5_10_0_MinGW_32bit-Release/release/example.exe crashed.

Starting D:\Tipikina\build-example-Desktop_Qt_5_10_0_MinGW_32bit-Release\release\example.exe...
QMetaObject::connectSlotsByName: Connecting slot on_comboBox_protocol_activated() with the first of the following compatible signals: ("activated(int)", "activated(QString)")
QMetaObject::connectSlotsByName: Connecting slot on_comboBox_date_activated() with the first of the following compatible signals: ("activated(int)", "activated(QString)")
QMetaObject::connectSlotsByName: Connecting slot on_comboBox_date_activated() with the first of the following compatible signals: ("activated(int)", "activated(QString)")
QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.
QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.
The program has unexpectedly finished.
The process was ended forcefully.
D:/Tipikina/build-example-Desktop_Qt_5_10_0_MinGW_32bit-Release/release/example.exe crashed.

QSqlQuery query;
query.exec("SELECT propertyNumber FROM monitoring WHERE deviceId = '"+QString::number(a.id) +"'");

QSqlQuery query;
query.exec(db_monitoring);
query.exec("SELECT propertyNumber FROM monitoring WHERE deviceId = '"+QString::number(a.id) +"'");

QSqlDatabase::addDatabase("QSQLITE", "скулите");
QSqlDatabase::addDatabase("QPSQL", "поскули");
QSqlDatabase::addDatabase("QMYSQL", "маскали");
 
/* ... */
 
QSqlQuery query(QSqlDatabase::database("маскали"));
query.prepare("SELECT propertyNumber FROM monitoring WHERE deviceId = :deviceId");
query.bindValue(":", a.id);
query.exec();

    if(D.size()){
        ui->comboBox_date->addItem(D[0]);
 
        for (int i = 1; i < D.size(); i++) {
            if (D[i] != D[i - 1])
                ui->comboBox_date->addItem(D[i]);
        }
    }

        ui->comboBox_date->addItem(D[0]);
 
        for (int i = 1; i < D.size(); i++) {
            if (D[i] != D[i - 1])
                ui->comboBox_date->addItem(D[i]);
        }