lib/baku/entity_manager.rb in baku-0.2.1 vs lib/baku/entity_manager.rb in baku-0.2.2

@@ -54,10 +54,12 @@
 
     private
 
     def add_entity_to_matching_component_lists(entity)
       @entities_by_component_mask.each do |component_mask, entities|
-        if component_mask.matches?(entity.component_mask)
+        component_mask_match = component_mask.matches?(entity.component_mask)
+
+        if component_mask_match && !entities.include?(entity)
           entities << entity
         end
       end
     end