The date '2013-05-22' is not a correct date range. piwik 1.12 (no replies)

After upgrading to 1.12 I get the following error on an api request:

{"result":"error", "message":"The date '2013-01-22' is not a correct date range. It should have the following format: 'lastN', 'previousN', 'YYYY-MM-DD,YYYY-MM-DD'."}

the request is

?module=API&action=index&date=2013-05-22,2013-05-29&period=range&idSite=34&token_auth=STRIPPED&format=json&flat=1&segment=pageTitle==Slapen+op+het+strand+2013+-+vakantiehuisjes+aan+zee&method=Actions.getPageUrls&filter_limit=1&filter_sort_column=nb_hits&filter_sort_order=desc

setting the method to getPageTitles doesn't give the error message

?module=API&action=index&date=2013-05-22,2013-05-29&period=range&idSite=34&token_auth=STRIPPED&format=json&flat=1&segment=pageTitle==Slapen+op+het+strand+2013+-+vakantiehuisjes+aan+zee&method=Actions.getPageTitles&filter_limit=1&filter_sort_column=nb_hits&filter_sort_order=desc