(790): Recoverable Error - Object of class Piwik\Plugins\Actions\Reports\GetEntryPageUrls could not be converted to string - Piwik 2.12.1

Hola,
he actualizado la versión de piwik a la 2.12.1 como me indicaba y me ha dado el siguiente error:

WARNING: /homepages/12/…/htdocs/piwik/core/Plugin/Report.php(790): Recoverable Error - Object of class Piwik\Plugins\Actions\Reports\GetEntryPageUrls could not be converted to string - Piwik 2.12.1 - Please report this message in the Piwik forums: http://forum.piwik.org (please do a search first as it might have been reported already)

Me indica que el error es recuperable, pero ¿cómo? ¿qué pasos tengo que dar?

Muchas gracias.

Hi there

can you upgrade to 2.13.0 beta and confirm if you still have the issue? I would like to test early beta and RC releases, how do I enable automatic updates to use these development versions? - Analytics Platform - Matomo