activity page refuses to load

Receiving this error today:
Fatal error: Call to a member function getURL() on a non-object in /var/www/html/elgg/views/default/river/object/comment/create.php on line 20

I have tried disabling all the custom plugins and error remains. I tried disabling some of the plugins ELGG came with and the problem remains. I cannot find any reason why the Activity just refuses to load. I can change the URL to something like "" which loads, and all other pages and administrative functions work fine, but it is just the default "/activity" that refuses to load today. The only thing I can think of is a comment from a deleted member is still trying to be displayed on the activity page...