Item bata bound event causing an error

I am trying to create a databound event for my hyperlink when it is blank from the database.
but when I impliment it it causes errors on the datagrid, but when I put same code in db it works, it also works when I comment out the ItemDatabound event, but what happens is some items are not links on the datagrid but just blank.

Private Sub myDataGrid_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles myDataGrid.ItemDataBound
        Dim Fixpage As String = e.Item.Cells(4).Text
        Dim hl As HyperLink = e.Item.Cells(4).FindControl("hlFix")

        If Fixpage = " " Or Fixpage = "" Then
            hl.NavigateUrl = "http://sharepoint/JFHQ/JSTAFF/J1/J1ARMY/Mob/Mob%20Tracker%20Fix%20Pages/Fix%20Page%20Library.aspx"
        End If
    End Sub


<asp:TemplateColumn HeaderText="Fix Page">
											<ItemTemplate>
												<asp:Hyperlink id="hlFix" runat="server" Text="Fix Page" NavigateUrl='<%# DataBinder.Eval (Container.DataItem,"strFilterPage") %>' Target="_blank"></asp:Hyperlink>  
											</ItemTemplate>
										</asp:TemplateColumn>

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