After 1 day of use, recording about 6000 entries in table
‘piwik_archive_blob_2008_03’, I get this error in every widget for yesterday view :

Uncaught exception: ‘Column nb_visits already in the array!’
More information
In /home/ideeforc/sd/piwik/modules/DataTable/Row.php on line 270
Backtrace:

```

1. /home/ideeforc/sd/piwik/plugins/Actions/Actions.php(257): Piwik_DataTable_Row→addColumn(‘nb_visits’, ‘1’)
2. /home/ideeforc/sd/piwik/plugins/Actions/Actions.php(111): Piwik_Actions→updateActionsTableWithRowQuery(Object(Zend_Db_Statement_Pdo))
3. [internal function]: Piwik_Actions→archiveDay(Object(Event_Notification))
4. /home/ideeforc/sd/piwik/libs/Event/Dispatcher.php(280): call_user_func_array(Array, Array)
5. /home/ideeforc/sd/piwik/libs/Event/Dispatcher.php(250): Event_Dispatcher→postNotification(Object(Event_Notification), true, false)
6. /home/ideeforc/sd/piwik/modules/PluginsManager.php(422): Event_Dispatcher→post(Object(Piwik_ArchiveProcessing_Day), ‘ArchiveProcessi…’, Array, true, false)
7. /home/ideeforc/sd/piwik/modules/ArchiveProcessing/Day.php(69): Piwik_PostEvent(‘ArchiveProcessi…’, Object(Piwik_ArchiveProcessing_Day))
8. /home/ideeforc/sd/piwik/modules/ArchiveProcessing.php(237): Piwik_ArchiveProcessing_Day→compute()
9. /home/ideeforc/sd/piwik/modules/Archive/Single.php(80): Piwik_ArchiveProcessing→loadArchive()
10. /home/ideeforc/sd/piwik/modules/ArchiveProcessing.php(386): Piwik_Archive_Single→prepareArchive()
11. /home/ideeforc/sd/piwik/modules/ArchiveProcessing.php(233): Piwik_ArchiveProcessing→loadSubperiodsArchive()
12. /home/ideeforc/sd/piwik/modules/Archive/Single.php(80): Piwik_ArchiveProcessing→loadArchive()
13. /home/ideeforc/sd/piwik/modules/Archive/Single.php(117): Piwik_Archive_Single→prepareArchive()
14. /home/ideeforc/sd/piwik/modules/Archive/Single.php(306): Piwik_Archive_Single→get(‘Referers_search…’, ‘blob’)
15. /home/ideeforc/sd/piwik/plugins/Referers/API.php(40): Piwik_Archive_Single→getDataTable(‘Referers_search…’, NULL)
16. /home/ideeforc/sd/piwik/plugins/Referers/API.php(53): Piwik_Referers_API→getDataTable(‘Referers_search…’, ‘1’, ‘month’, ‘2008-03-12’)
17. [internal function]: Piwik_Referers_API→getKeywords(‘1’, ‘month’, ‘2008-03-12’)
18. /home/ideeforc/sd/piwik/modules/API/Proxy.php(462): call_user_func_array(Array, Array)
19. [internal function]: Piwik_API_Proxy→__call(‘getKeywords’, Array)
20. [internal function]: Piwik_API_Proxy→getKeywords(‘1’, ‘month’, ‘2008-03-12’)
21. /home/ideeforc/sd/piwik/modules/API/Request.php(140): call_user_func_array(Array, Array)
22. /home/ideeforc/sd/piwik/modules/ViewDataTable.php(352): Piwik_API_Request→process()
23. /home/ideeforc/sd/piwik/modules/ViewDataTable/Html.php(45): Piwik_ViewDataTable→loadDataTableFromAPI()
24. /home/ideeforc/sd/piwik/modules/Controller.php(43): Piwik_ViewDataTable_Html→main()
25. /home/ideeforc/sd/piwik/plugins/Referers/Controller.php(86): Piwik_Controller→renderView(Object(Piwik_ViewDataTable_Html), false)
26. [internal function]: Piwik_Referers_Controller→getKeywords()
27. /home/ideeforc/sd/piwik/modules/FrontController.php(120): call_user_func_array(Array, Array)
28. /home/ideeforc/sd/piwik/index.php(62): Piwik_FrontController→dispatch()
29. {main}
    ```