Getting error

# Running tests:

.........EEEE.........

Finished tests in 0.440641s, 49.9273 tests/s, 65.8132 assertions/s.

  1) Error:
UserFriendshipsControllerTest#test_: #index when logged in should assign user_friendships. :
ActionView::Template::Error: undefined method `full_name' for nil:NilClass
    app/views/user_friendships/index.html.erb:12:in `block in _app_views_user_friendships_index_html_erb__2562809195414119847_70281940281000'
    app/views/user_friendships/index.html.erb:5:in `each'
    app/views/user_friendships/index.html.erb:5:in `_app_views_user_friendships_index_html_erb__2562809195414119847_70281940281000'
    test/controllers/user_friendships_controller_test.rb:27:in `block (3 levels) in <class:UserFriendshipsControllerTest>'

<div class="page-header">
  <h1>Friends</h1>
</div>

<% @user_friendships.each do |friendship| %>
  <% friend = friendship.friend %>
  <div id="<%= dom_id(friendship) %>" class="friend row">
    <div class="span1">

    </div>
    <div class="span7">
      <strong><%= friend.full_name %></strong><br />
        <% if friendship.pending? %>
          <em>Friendship is pending.</em> <%= link_to "Delete request", edit_user_friendship_path(friendship) %>.
        <% end %>
        <% if friendship.requested? %>
          <em>Friendship requested.</em> <%= link_to "Accept Friendship", edit_user_friendship_path(friendship) %>.
        <% end %>
        <% if friendship.accepted? %>
          <em>Friendship started <%= friendship.updated_at %>.</em> <%= link_to "Update friendship", edit_user_friendship_path(friendship) %>.
        <% end %>
    </div>
  </div>
<% end %>

should "display friend's names" do
        assert_match /Pending/, response.body
        assert_match /Active/, response.body
      end

      should "display pending information on a pending friendship" do
        assert_select "#user_friendship_#{@friendship1.id}" do
          assert_select "em", "Friendship is pending."
        end
      end