Error after update to 3.9.0

Hi,

after updating to 3.9.0 I got the following error messages (not all of them are shown):

Warning: Invalid argument supplied for foreach() in /homepages/6/d622902521/htdocs/clickandbuilds/WordPress/Fichtelgebirgsverein/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/widget/package.module.widget.php on line 87

Warning: Invalid argument supplied for foreach() in /homepages/6/d622902521/htdocs/clickandbuilds/WordPress/Fichtelgebirgsverein/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/widget/package.module.widget.php on line 87

Warning: Invalid argument supplied for foreach() in /homepages/6/d622902521/htdocs/clickandbuilds/WordPress/Fichtelgebirgsverein/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/widget/package.module.widget.php on line 87

Warning: Invalid argument supplied for foreach() in /homepages/6/d622902521/htdocs/clickandbuilds/WordPress/Fichtelgebirgsverein/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/widget/package.module.widget.php on line 87

Warning: Invalid argument supplied for foreach() in /homepages/6/d622902521/htdocs/clickandbuilds/WordPress/Fichtelgebirgsverein/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/widget/package.module.widget.php on line 87

Warning: Invalid argument supplied for foreach() in /homepages/6/d622902521/htdocs/clickandbuilds/WordPress/Fichtelgebirgsverein/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/widget/package.module.widget.php on line 87

After this I deactivated all plugins besides NextGEN Gallery and the error message still appears. So the error does definitely not come from other plugins.

It would be nice if someone could help me, because I have a lot of galleries which do not work now.

Thanks very much in advance.

Best regards

Albert