Read information of ID causing error from Exception

Question

In C# My Sql Entity Framework 6 Insert is return exception

Cannot add or update a child row: a foreign key constraint fails (portaldb.masterselectionhistory, CONSTRAINT FK_MasterSelectionHistory_Contacts_MasterId FOREIGN KEY (MasterId) REFERENCES masters (Id) ON DELETE CASCADE)

The exception is occuring while trying to insert a List of records to the db

try{
    List<int> masterIds =  // around 20k ID exists 
                    foreach (int id in masterIds)
                    {
                        //Add Selection History to record against the contact!
                        #region insert to ContactSelectionHistory 
                        MasterSelectionHistory dbEntry = new MasterSelectionHistory();
                        dbEntry.MasterId = id;
                        dbEntry.SelectionId = --;
                        dbEntry.DateCreated = DateTime.Now;
                        dbEntry.CreatedBy = ---;
                        context.MasterSelectionHistory.Add(dbEntry);
                        #endregion
                    }  
    
                    //Save all the db context changes
                    await context.SaveChangesAsync().ConfigureAwait(false);  //EXception is throwing from here
 }
                catch (Exception ex)
                {
                   //Can read ID causing error from ex object ?
                    throw new InvalidOperationException(ex.Message);
                }

Is there any way to know which among the ID is causing the issue from exception object