I've build a newsletter system, with the control panel as single page under the dashboard.

When rendering the page in the dashboard, I get a Warning: Invalid argument supplied for foreach() under concrete/themes/core/dashboard.php on line 177.

I've checked the errors array, it has one null value so I'm rather lost.

The above error doesn't affect the functionality of the nl system so much as the user's eyesight with all the bright red.

Any ideas? Gracias :)