[XL-2010] Assigner la valeur Nothing à un Object

Bonjour,

Lorsque j'assigne la valeur "Nothing" à un Object, la fonction ne se rend pas au bout. Voici mon code, ça plante à la ligne 90. Merci!
Code:
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Function calculPrime(annee, choixLimite, cotRisque) As Double
 
Application.Volatile
 
Dim borneInferieure As Double
Dim borneSuperieure As Double
Dim myRangeName As String
Dim nbRows As Integer
Dim txPrimeInferieur
Dim txPrimeSuperieur
Dim i As Integer
 
Dim wbk As Workbook
 
Set wbk = GetObject("L:\CSST\Outils\Addins\Parametres\ParamTauxPrime.xlsx")
 
myRangeName = "Taux" & annee
 
 
borneInferieure = -1
 
i = 1
 
Set myRange = wbk.Worksheets("ParamTaux").Range(myRangeName)
 
nbRows = myRange.Rows.Count
 
 Select Case choixLimite
    Case Is = 150
       colonneChoix = 2
    Case Is = 200
       colonneChoix = 3
    Case Is = 250
       colonneChoix = 4
    Case Is = 300
       colonneChoix = 5
    Case Is = 400
       colonneChoix = 6
    Case Is = 500
       colonneChoix = 7
    Case Is = 600
       colonneChoix = 8
    Case Is = 700
       colonneChoix = 9
    Case Is = 800
       colonneChoix = 10
    Case Is = 900
       colonneChoix = 11
    End Select
 
Application.ScreenUpdating = False
 
While borneInferieure < 0
 
    If cotRisque < myRange.Cells(i, 1).Value Then
 
        borneInferieure = 0
        borneSuperieure = myRange.Cells(i, 1).Value
 
        calculPrime = Round(myRange(i, colonneChoix), 4)
 
    End If
 
    If cotRisque >= myRange.Cells(nbRows, 1).Value Then
 
        borneInferieure = myRange.Cells(nbRows, 1).Value
        borneSuperieure = myRange.Cells(nbRows, 1).Value
 
        calculPrime = Round(myRange(nbRows, colonneChoix), 4)
 
    End If
 
    If cotRisque >= myRange.Cells(i, 1).Value And cotRisque < myRange.Cells(i + 1, 1).Value Then
 
        borneInferieure = myRange.Cells(i, 1).Value
        borneSuperieure = myRange.Cells(i + 1, 1).Value
 
        txPrimeInferieur = myRange(i, colonneChoix)
        txPrimeSuperieur = myRange(i + 1, colonneChoix)
 
        calculPrime = Round(txPrimeInferieur - ((cotRisque - borneInferieure) * (txPrimeInferieur - txPrimeSuperieur)) / (borneSuperieure - borneInferieure), 4)
 
    End If
 
    i = i + 1
 
Wend
 
wbk.Close
wbk = Nothing
 
End Function