Graph some device don't Ok

Hello,

Some device don’t graph, discovery & poller is OK .
But the graphs is empty .

Do you have an idea ?

When I start poller.php manualy, I can see the graph.
Not when it’s done with cron (poller-wrapper).

It’s very strange, it’s just some devices.

It’s Ok
rdd files with a bad permisssion.
Sorry