FindColumnWithPropertyName fails and crash, why? about sqlite-net HOT 3 OPEN

[Serializable]
[Preserve(AllMembers=true)]
public class MyVocabEntry
                {
                   ...
                 }

public class MyVocabEntry
                {

[PrimaryKey, AutoIncrement]
public int ID { get; set; }

[Indexed]
public int EntryIndex { get; set; }

public string StemLemma { get; set; }

public string Etimology { get; set; }

[Indexed]
public string Word { get; set; }

public string PartOfSpeech { get; set; }
public string Morphology { get; set; }
public string Definitions { get; set; }

[Indexed]
public string Synonyms { get; set; }

[Indexed]
public string Antonyms { get; set; }


public override bool Equals (object obj)
{
if (obj is MyVocabEntry) {
    return this.GetHashCode() == obj.GetHashCode();  
}  else {
    return base.Equals(obj);
}
}

public override string ToString ()
{
return string.Format ("[MyVocabEntry]") + "," + EntryIndex + "," +Word + "," + StemLemma;
}

public override int GetHashCode ()
{
unchecked
    {
        int result = 37; // prime

        result *= 397; // also prime
        if (EntryIndex != 0)
            result += EntryIndex.ToString().GetHashCode();

        result *= 397;
        if (Word != null)
            result += Word.GetHashCode();

        result *= 397;
        if (StemLemma != null)
            result += StemLemma.GetHashCode();

        return result;
    }
}

                }