Warning Error Message, Idea is set to Everybody and Public

I’m recieving an error messag on all of my idea’s pages.

It appears when visit the idea’s inner pages such as:
https://teslacrafts.com/idea/test-4/
https://teslacrafts.com/idea/test-5/

Error Message
Warning: in_array() expects parameter 2 to be array, null given in /home3/wiltseng/TeslaCrafts.com/wp-content/plugins/ideapush/inc/functions/single-idea.php on line 26

When I’m logged in as Administrator I do not see this message.
Please help.

Thanks,
Wilson

The page I need help with: [log in to see the link]