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@@ -60,7 +60,7 @@ module YARD
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       def process_objects(object)
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         @objects[object.path] = object
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-        @objects[object.superclass.path] = object.superclass if object.is_a?(CodeObjects::ClassObject)
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+        @objects[object.superclass.path] = object.superclass if object.is_a?(CodeObjects::ClassObject) && object.superclass
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         object.mixins.each {|o| @objects[o.path] = o }
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         namespaces(object).each {|o| process_objects(o) }

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@@ -1,5 +1,5 @@
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-<% for obj in @objects.select {|o| CodeObjects::ClassObject === o && o.superclass != P(:Object) } %>
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-  <% [obj, obj.superclass].each do |o| %>
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+<% for obj in @objects.select {|o| CodeObjects::ClassObject === o && o.superclass && o.superclass != P(:Object) } %>
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+  <% [obj, obj.superclass].compact.each do |o| %>
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     <% if o != Registry.root && (!o.respond_to?(:children) || !namespaces(o).empty?) %>
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       <%= format_path o %> [label="{<%= o.type %> <%= o.path %>}" rank=sink];
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     <% end %>