Problem With combo-box ***(KIND A) RESOLVED ***

[Lightning]

Whenever I fill a combo-box from a recordset (with this code):

While Not TempRS.EOF
    Combo1.AddItem TempRS.Fields("sdOmsch"), TempRS.Fields("ndCode")
    TempRS.MoveNext
Wend

ndCode = integer
sdOmsch = string

This is no problem, but whenever I (the code) try's to add the 27th item, it gives an error:

Run-time error '5':
Invalid procedure call or argument


Does anybody have a clue
Ow, yes ndCode is the primary key of that table