diff --git a/lib/ascii_binder/topic_entity.rb b/lib/ascii_binder/topic_entity.rb
index 169ee8f..d5c2c54 100644
--- a/lib/ascii_binder/topic_entity.rb
+++ b/lib/ascii_binder/topic_entity.rb
@@ -153,7 +153,7 @@ def include?(distro_key,single_page_path)
       return false unless distro_keys.include?(distro_key)
 
       # If we're building a single page, check if we're on the right track.
-      if single_page_path.length > 0
+      if single_page_path.length > 0  and not single_page_path[depth].nil?
         if is_group?
           return false unless single_page_path[depth] == dir
         elsif is_topic?