Issue with creating and editing users after upgrade to 5.6.3.4

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Hi Community, any insight you can give into this would be very helpful! Note to keep our client anonymous I have replaced the domain with "[site]" in the code below.
Thanks in advance!!

We have upgraded several site to 5.6.3.4 and it seems to have worked but have found an issue with users.

In Dashboard > Search Users when you Add User and submit the form, it shows an error

Invalid form token. Please reload this form and submit again.


If I go back to the Search Users page, I can refresh the page and the new user is on the list. If I try and edit that user, the page does not load completely and all the styling is broken. If I check firebug console I see:

http://www.[thesite].com/index.php/dashboard/users/search?uID=9 
500 server error


If I check the server logs I see this

2017/01/20 17:14:08 [error] 7040#7040: *20349 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Call to a member function displaySummary() on null in /var/www/sites/[site].com/html/updates/concrete5.6.3.4/concrete/elements/users/search_results.php on line 132" while reading response header from upstream, client: [my ip] , server:http://www.[site].com, request: "GET /index.php/dashboard/users/search?uID=9 HTTP/1.0", upstream: "fastcgi://unix:/run/php/php5-fpm-[site].com.sock:", host: "www.[site].com", referrer: "http://www.[site].com/index.php/dashboard/users/search/"


And here is my environment dump from the settings area of the dashboard

# concrete5 Version
5.6.3.4
# concrete5 Packages
Category Listing (1.0), Designer Content (3.1.1), Google Map (Premium) (2.0), Page List Teasers (1.01), Smooth Scroller (1.2), SQL Buddy (1.0), tnSpacer (1.2).
# concrete5 Overrides
blocks/page_list, blocks/testimonials, blocks/principal_item, themes/klass_v1, tools/help.php
# concrete5 Cache Settings
Block Cache - On
Overrides Cache - Off
Full Page Caching - Off
# Server Software
nginx/i-Content
# Server API
fpm-fcgi
# PHP Version