base on the call stack I would agree with Bonnie, Michel is the ocommand created only on that method is is a shared object?
Also oparameters is that a local variable or a property of the class?
is that class shared between diferent objects?

>Something with your parameters maybe?
>
>~~Bonnie?
>
>
>>This is the new approach:
>>
>>

>>                oCommand.CommandText = cSQL
>>
>>                ' Only add the parameters if we have some
>>                If oParameters2.Count > 0 Then
>>                    For Each oDataParameter In oParameters2
>>                        oCommand.Parameters.Add(oDataParameter)
>>                    Next
>>                End If
>>
>>                oDataAdapter.SelectCommand = oCommand
>>
>>                nResult = oDataAdapter.SelectCommand.ExecuteNonQuery()
>>

>>
>>However, it happens again today. This is executed several times per day. It is the same command coming in from the same class. The error is:
>>
>>

>>Object reference not set to an instance of an object.
>>

>>
>>The stack trace is:
>>
>>

>>at System.Data.ProviderBase.DbReferenceCollection.AddItem(Object value, Int32 tag)
>>   at System.Data.OleDb.OleDbReferenceCollection.Add(Object value, Int32 tag)
>>   at System.Data.ProviderBase.DbConnectionInternal.AddWeakReference(Object value, Int32 tag)
>>   at System.Data.OleDb.OleDbConnection.AddWeakReference(Object value, Int32 tag)
>>   at System.Data.OleDb.OleDbCommand.PropertiesOnCommand(Boolean throwNotSupported)
>>   at System.Data.OleDb.OleDbCommand.InitializeCommand(CommandBehavior behavior, Boolean throwifnotsupported)
>>   at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult)
>>   at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
>>   at System.Data.OleDb.OleDbCommand.ExecuteNonQuery()
>>   at Framework.Framework.Data.SQLUpdate(String tcSQL, Boolean tlUpdate)
>>

>>
>>The SQL command is:
>>
>>

>>UPDATE MagazineNETSchedule SET ModUser=0,ModDate={^2007/01/05 07:48:32},Hit=? WHERE Numero=?
>>

>>
>>I just can't understand why this is happening at once and works at 99.9% of the time.