When the archiving cron task is executed :

/usr/bin/php5 /var/www/piwik/console core:archive --url=https://piwik.website.net > /var/www/piwik/piwik-archive.log

I got the following error since upgrading to 2.14.1 :

ERROR [2015-07-18 23:19:02] Got invalid response from API request: ?module=API&
method=API.get&idSite=4&period=year&date=last2&format=php&trigger=archivephp. Response
was 'PHP Fatal error: Maximum function nesting level of '100' reached, aborting! in /var/www/piwik
/core/DataTable/Manager.php on line 105 PHP Stack trace: PHP 1. {main}() /var/www
/piwik/console:0 PHP 2. Symfony\Component\Console\Application->run() /var/www/piwik
/console:27 PHP 3. Piwik\Console->doRun() /var/www/piwik/vendor/symfony/console/Symfony
/Component/Console/Application.php:126 PHP 4. Piwik\Access::doAsSuperUser() /var/www
/piwik/core/Console.php:80 PHP 5. Piwik\Console->Piwik{closure}() /var/www/piwik
/core/Access.php:456 PHP 6. call_user_func() /var/www/piwik/core/Console.php:79 PHP 7.
Symfony\Component\Console\Application->doRun() /var/www/piwik/core/Console.php:79 PHP
8. Symfony\Component\Console\Application->doRunCommand() /var/www/piwik/vendor
/symfony/console/Symfony/Component/Console/Application.php:195 PHP 9. Symfony\Component
\Console\Command\Command->run() /var/www/piwik/vendor/symfony/console/Symfony
/Component/Console/Application.php:874 PHP 10. Piwik\CliMulti\RequestCommand->execute()
/var/www/piwik/vendor/symfony/console/Symfony/Component/Console/Command
/Command.php:257 PHP 11. require_once() /var/www/piwik/core/CliMulti
/RequestCommand.php:79 PHP 12. require_once() /var/www/piwik/index.php:27 PHP 13.
Piwik\FrontController->dispatch() /var/www/piwik/core/dispatch.php:34 PHP 14.
Piwik\FrontController->doDispatch() /var/www/piwik/core/FrontController.php:94 PHP 15.
call_user_func_array() /var/www/piwik/core/FrontController.php:494 PHP 16. Piwik\Plugins
\API\Controller->index() /var/www/piwik/core/FrontController.php:494 PHP 17. Piwik\API
\Request->process() /var/www/piwik/plugins/API/Controller.php:37 PHP 18. Piwik\API
\Proxy->call() /var/www/piwik/core/API/Request.php:238 PHP 19. call_user_func_array()
/var/www/piwik/core/API/Proxy.php:211 PHP 20. Piwik\Plugins\API\API->get() /var/www/piwik
/core/API/Proxy.php:211 PHP 21. Piwik\API\Proxy->call() /var/www/piwik/plugins
/API/API.php:405 PHP 22. call_user_func_array() /var/www/piwik/core/API/Proxy.php:211 PHP
23. Piwik\Plugins\VisitsSummary\API->get() /var/www/piwik/core/API/Proxy.php:211 PHP 24.
Piwik\Archive->getDataTableFromNumeric() /var/www/piwik/plugins/VisitsSummary/API.php:35
PHP 25. Piwik\Archive->get() /var/www/piwik/core/Archive.php:324 PHP 26.
Piwik\Archive->getArchiveIds() /var/www/piwik/core/Archive.php:598 PHP 27.
Piwik\Archive->cacheArchiveIdsAfterLaunching() /var/www/piwik/core/Archive.php:660 PHP 28.
Piwik\Archive->prepareArchive() /var/www/piwik/core/Archive.php:708 PHP 29.
Piwik\ArchiveProcessor\Loader->prepareArchive() /var/www/piwik/core/Archive.php:894 PHP
30. Piwik\ArchiveProcessor\Loader->prepareAllPluginsArchive() /var/www/piwik
/core/ArchiveProcessor/Loader.php:72 PHP 31. Piwik\ArchiveProcessor
\PluginsArchiver->callAggregateCoreMetrics() /var/www/piwik/core/ArchiveProcessor
/Loader.php:116 PHP 32. Piwik\ArchiveProcessor
\PluginsArchiver->aggregateMultipleVisitsMetrics() /var/www/piwik/core/ArchiveProcessor
/PluginsArchiver.php:63 PHP 33. Piwik\ArchiveProcessor->aggregateNumericMetrics() /var/www
/piwik/core/ArchiveProcessor/PluginsArchiver.php:211 PHP 34.
Piwik\ArchiveProcessor->getAggregatedNumericMetrics() /var/www/piwik
/core/ArchiveProcessor.php:256 PHP 35. Piwik\Archive->getDataTableFromNumeric() /var/www
/piwik/core/ArchiveProcessor.php:549 PHP 36. Piwik\Archive->get() /var/www/piwik
/core/Archive.php:324 PHP 37. Piwik\Archive->getArchiveIds() /var/www/piwik
/core/Archive.php:598 PHP 38. Piwik\Archive->cacheArchiveIdsAfterLaunching() /var/www/piwik
/core/Archive.php:660 PHP 39. Piwik\Archive->prepareArchive() /var/www/piwik
/core/Archive.php:708 PHP 40. Piwik\ArchiveProcessor\Loader->prepareArchive() /var/www
/piwik/core/Archive.php:894 PHP 41. Piwik\ArchiveProcessor\Loader->prepareAllPluginsArchive()
/var/www/piwik/core/ArchiveProcessor/Loader.php:72 PHP 42. Piwik\ArchiveProcessor
\PluginsArchiver->callAggregateCoreMetrics() /var/www/piwik/core/ArchiveProcessor
/Loader.php:116 PHP 43. Piwik\ArchiveProcessor
\PluginsArchiver->aggregateMultipleVisitsMetrics() /var/www/piwik/core/ArchiveProcessor
/PluginsArchiver.php:63 PHP 44. Piwik\ArchiveProcessor->aggregateNumericMetrics() /var/www
/piwik/core/ArchiveProcessor/PluginsArchiver.php:211 PHP 45.
Piwik\ArchiveProcessor->getAggregatedNumericMetrics() /var/www/piwik
/core/ArchiveProcessor.php:256 PHP 46. Piwik\Archive->getDataTableFromNumeric() /var/www
/piwik/core/ArchiveProcessor.php:549 PHP 47. Piwik\Archive->get() /var/www/piwik
/core/Archive.php:324 PHP 48. Piwik\Archive->getArchiveIds() /var/www/piwik
/core/Archive.php:598 PHP 49. Piwik\Archive->cacheArchiveIdsAfterLaunching() /var/www/piwik
/core/Archive.php:660 PHP 50. Piwik\Archive->prepareArchive() /var/www/piwik
/core/Archive.php:708 PHP 51. Piwik\ArchiveProcessor\Loader->prepareArchive() /var/www
/piwik/core/Archive.php:894 PHP 52. Piwik\ArchiveProcessor\Loader->prepareAllPluginsArchive()
/var/www/piwik/core/ArchiveProcessor/Loader.php:72 PHP 53. Piwik\ArchiveProcessor
\PluginsArchiver->callAggregateAllPlugins() /var/www/piwik/core/ArchiveProcessor
/Loader.php:122 PHP 54. Piwik\Plugins\Actions\Archiver->aggregateMultipleReports() /var/www
/piwik/core/ArchiveProcessor/PluginsArchiver.php:112 PHP 55.
Piwik\ArchiveProcessor->aggregateDataTableRecords() /var/www/piwik/plugins/Actions
/Archiver.php:502 PHP 56. Piwik\Common::destroy() /var/www/piwik
/core/ArchiveProcessor.php:225 PHP 57. Piwik\DataTable->__destruct() /var/www/piwik
/core/Common.php:1255 PHP 58. Piwik\Common::destroy() /var/www/piwik
/core/DataTable.php:343 PHP 59. Piwik\DataTable\Row->__destruct() /var/www/piwik
/core/Common.php:1255 PHP 60. Piwik\DataTable\Manager->deleteTable()
ERROR [2015-07-18 23:19:02] 2 total errors during this script execution, please investigate and
try and fix these errors.
[Exception]
2 total errors during this script execution, please investigate and try and fix these errors.

It was working well with 2.14 and before.