diff --git a/lib/acts_as_taggable_on/taggable/core.rb b/lib/acts_as_taggable_on/taggable/core.rb
index 734d82aa1..0cc68ff52 100644
--- a/lib/acts_as_taggable_on/taggable/core.rb
+++ b/lib/acts_as_taggable_on/taggable/core.rb
@@ -108,7 +108,7 @@ def grouped_column_names_for(object)
     end
 
     def custom_contexts
-      @custom_contexts ||= taggings.map(&:context).uniq
+      @custom_contexts ||= []
     end
 
     def is_taggable?