undefined index error easyblog 5

hello, i am getting an undefined index error.
Notice: Undefined index: hf42cfecd in /mysite-/components/com_easyblog/services/weblog.php on line 1
this error is repeated over 100 times before the blog shows. This happened before updating, i have now updated and still the error occurs. You can view by going to the blog page on the site

updated to easyblog version 5.0.39 from my account
Joomla 3.6.3

thanks in advance for any help