.

exp_legacy/module/modules/gui/vlayer.lua

@@ -91,6 +91,7 @@ Selection.on_selection(SelectionConvertArea, function(event)
             entities = event.surface.find_entities_filtered{ area = area, name = "constant-combinator", force = player.force }
         else
             player.print{ "vlayer.power-on-space-research", config.power_on_space_research.name, config.power_on_space_research.level }
+            return nil
         end
     else
         entities = event.surface.find_entities_filtered{ area = area, name = "steel-chest", force = player.force }