@mattab opened this issue on January 10th 2014

http://demo.piwik.org/index.php?module=API&method=Actions.getPageUrls&idSite=3&period=day&date=yesterday&format=xml&filter_truncate=0&flat=1

<error message="Trying to add two strings values in DataTable\Row::sumRowArray: '88%' + '100%'"/>

This is caused by the flattener filter which executes the Queued filters. After executing the queued filters, the processed metrics are added to the table. Then the Truncate filters runs and KABOOM, we cannot sum the processed metrics columns.

I'm not sure what the correct fix would be?

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