Can't view week/month/year

i am using piwik on two sites. one has arround 100 visits per day, the other around 5k-6k.
when i click on eg week at the smaller site, i see the data,
on the bigger site: i am getting

Allowed memory size of 134217728 bytes exhausted (tried to allocate 8208 bytes) in /www/htdocs/XXUSERXX/piwik/core/DataTable.php on line 935

in all widgets
how can i solve this?

At present, the only workaround is to increase your memory_limit. We have a ticket to investigate the source of the memory leak.