How to properly use IsError in query

[melody.anne]

I want this query to count all of the different types of order (Clase de Orden) and if a type of order isn't found, to return zero. How do I do this using IsError, since when it doesn't find an order, it gives me an error. This is the query:

TRANSFORM Count([E 025].Porción) AS CountOfPorción
SELECT [Listado de Empleados].Supervisor, [E 025].[Alias de TP], [E 025].Usuario, Teléfonos.Telefono, Count([E 025].Porción) AS [Total Of Porción]
FROM Teléfonos INNER JOIN ([Listado de Empleados] INNER JOIN [E 025] ON [Listado de Empleados].[Codigo de Usuario] = [E 025].Usuario) ON Teléfonos.Alias = [E 025].[Alias de TP]
GROUP BY [Listado de Empleados].Supervisor, [E 025].[Alias de TP], [E 025].Usuario, Teléfonos.Telefono
ORDER BY [Listado de Empleados].Supervisor
PIVOT [E 025].[Clase de Orden];

 

[JHB]

You can't use IsError for that.
Below is a link to the description of IsError.
https://support.office.com/en-ie/article/IsError-Function-40a89200-138b-4e60-b254-34aea51b2e6b