Either the size or the width and height can be passed but passing
both doesn't make any sense and in rails 5.0 will error.
<% if @user && @user.id %>
<div class='dropdown user-menu logged-in'>
<a class='dropdown-toggle' data-toggle='dropdown' href="#">
- <%= user_thumbnail_tiny(@user, :size => 25, :width => 25, :height => 25)
+ <%= user_thumbnail_tiny(@user, :width => 25, :height => 25)
%><%= render :partial => 'layouts/inbox'
%><span class="user-button"><span class='username'><%= @user.display_name %></span>
<b class="caret"></b></span>