C# Mysql query always giving syntax error when using 'addwithvalue' with an int

SOLUTION Okey so the solution was that the name "interval" seems to be used for something else in MySQL, changing the column name solved it.

EDIT The error I receive is:

Exception thrown: 'MySql.Data.MySqlClient.MySqlException' in MySql.Data.dll
MySql.Data.MySqlClient.MySqlException (0x80004005): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'interval) VALUES('20180307', '12:36:29.0', '01:03:51.9', '5')' at line 1
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
   at MySql.Data.MySqlClient.Driver.GetResult(Int32 statementId, Int32& affectedRows, Int64& insertedId)
   at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
   at HeartRateApp.HrmReader.UploadToDatabase(HRM hrm) in C:\Users\Emil Vidmark\source\repos\HeartRateApp\HeartRateApp\HrmReader.cs:line 77

I want to extract data from a file and insert the data into a database. It is working fine as long as I have strings that I add into the query but when I want to add int:s it gives me syntax error.

When I'm trying to use the function 'addwithvalue' for the '@interval' in my syntax it says that I have error in the syntax. And it is only when I'm tryng to add the 'interval' to the query it happens.

Is there anyone out there who has a solution to the problem?

        private void UploadToDatabase(HRM hrm)
    {
        //The string with the info to the db.
        string connectionString = "Server=127.0.0.1;Port=3306;Database=mydb;Uid=root;password=root";
        MySqlConnection connection = new MySqlConnection(connectionString);
        MySqlCommand command = connection.CreateCommand();

        command.CommandText = "INSERT INTO training_sessions(date, start_time, length, interval) VALUES(@date, @start_time, @length, @interval)";
        command.Parameters.AddWithValue("@date", hrm.GetDate());
        command.Parameters.AddWithValue("@start_time", hrm.GetStartTime());
        command.Parameters.AddWithValue("@length", hrm.GetLength());
        command.Parameters.AddWithValue("@interval", hrm.GetInterval());
       // command.Parameters.AddWithValue("@maxhr", hrm.GetMaxHR());
       // command.Parameters.AddWithValue("@resthr", hrm.GetRestHR());
       // command.Parameters.AddWithValue("@vo2max", hrm.GetVO2Max());
       // command.Parameters.AddWithValue("@weight", hrm.GetWeight());
       // command.Parameters.AddWithValue("@runningindex", hrm.GetRunningIndex());

        try
        {
            connection.Open();
            command.ExecuteNonQuery();
            connection.Close();
        }
        catch (Exception ex)
        {
            System.Windows.Forms.MessageBox.Show(ex.ToString());
        }
    }

The class HRM is looking like this:

    class HRM
{
    private string Date;
    private string StartTime;
    private string Length;
    private int Interval;
    private int MaxHR;
    private int RestHR;
    private int VO2Max;
    private int Weight;
    private int RunningIndex;
    private int[] HRValues;
    public HRM(string date, string startTime, string length, int interval, 
    int maxHR, int restHR, int VO2Max, int weight, int runningIndex, int[] 
    HRValues)
    {
        this.Date = date;
        this.StartTime = startTime;
        this.Length = length;
        this.Interval = interval;
        this.MaxHR = maxHR;
        this.RestHR = restHR;
        this.VO2Max = VO2Max;
        this.Weight = weight;
        this.RunningIndex = runningIndex;
        this.HRValues = HRValues;

    }
    public string GetDate()
    {
        return this.Date;
    }

    public string GetStartTime()
    {
        return this.StartTime;
    }

    public string GetLength()
    {
        return this.Length;
    }

    public int GetInterval()
    {
        return this.Interval;
    }

    public int GetMaxHR()
    {
        return this.MaxHR;
    }

    public int GetRestHR()
    {
        return this.RestHR;
    }

    public int GetVO2Max()
    {
        return this.VO2Max;
    }

    public int GetWeight()
    {
        return this.Weight;
    }

    public int GetRunningIndex()
    {
        return this.RunningIndex;
    }

    public int[] GetHRValues()
    {
        return this.HRValues;
    }

}

}