Fixing small bug

app/services/topics_importer.rb

@@ -20,8 +20,11 @@ class TopicsImporter
 
         if !topic_exists? topic_name
           topic = Topic.where(name: topic_name).new
+        elsif @@topics[topic_name].nil?
+          topic = Topic.find_by_name topic_name
         end
 
+
         create_relations(topic_name)
         learning_object.topics << topic
         @@topics[topic_name] = topic