Duplicate Record Inserted With Stored Procedure

I'm calling the stored procedure below to insert a record but every record is inserted into my table twice. I can't figure out why. I'm using Sql Server 2000.  Thanks.CREATE PROCEDURE sp_AddUserLog
(
@Username varchar(100),
@IP varchar(50)
)
AS
SET NOCOUNT ON
INSERT INTO TUserLogs (Username, IP)
VALUES (@Username, @IP)
GO  Sub AddUserLog(ByVal Username As String)
Dim SqlText As String
Dim cmd As SqlCommand
Dim strIPAddress As String

'Get the users IP address
strIPAddress = Request.UserHostAddress

Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("MyConnectionString").ConnectionString)
SqlText = "sp_AddUserLog"
cmd = New SqlCommand(SqlText)
cmd.CommandType = CommandType.StoredProcedure
cmd.Connection = con

cmd.Parameters.Add("@Username", SqlDbType.VarChar, 100).Value = Username
cmd.Parameters.Add("@IP", SqlDbType.VarChar, 100).Value = strIPAddress

Try
con.Open()
cmd.ExecuteNonQuery()
Finally
con.Close()
End Try

End Sub