Fatal error: Cannot access empty property in /sites/all/modules/simplenews/simplenews.module on line 383

Using clean D7 stable and latest simplenews 7.x-1.x-dev and PHP 5.3.1. Create two nodes, one of a blog type and another one of a simplenews enabled content type. When visiting any page where both nodes will be loaded (for example admin/content/node) PHP will give fatal error:

Fatal error: Cannot access empty property in /drupal/sites/all/modules/simplenews/simplenews.module on line 383

Problem is in simplenews_node_load() hook - if it gets multiple mixed nodes (some which are simplenews enabled and others that are not) it will ignore this case and call simplenews_newsletter_defaults() for each node.