Warning: invalid argument supplied for foreach() in...

I added a feed type of aggregator_node and after running cron received the following error:

Invalid argument supplied for foreach() in {pathtosite}/sites/default/modules/feedparser/feedaggregator_node.module on line 164.

No items are added to the "news aggregator" menu at '/aggregator'. When I ran cron again both right after and after deleted the times from that feed, it did not error and did not add any items, however, there are items in the 'aggregator_enclosure' table.