Canvas LMS/Troubleshooting

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Issue: When trying to log in with admin account, an error occurs citing "Oops! something broke". When checking the logs, this is found:

ActionView::TemplateError (undefined method `[]' for nil:NilClass) on line #82 of app/views/layouts/application.html.erb:
79:           :assignments_recently_graded    => t('menu.assignments_recently_graded', "Recently Graded")
80:         }
81:         total_shown = 0
82:         if assignment_sets.any?{ |k, v| @current_user.send(k).length > 0 }
83:       -%>
84:         <a href="/assignments" class="menu-item-title"><%= t('menu.assignments', 'Assignments') %><sp an class="menu-item-
title-icon"></span> < i class="icon-mini-arrow-down"></i></a>
85:
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