.

exp_scenario/module/gui/vlayer.lua

@@ -197,7 +197,9 @@ end
 function Elements.stats_table.refresh_online()
     for _, controls in Elements.controls:online_elements() do
         local elements = Elements.controls.data[controls]
-        local surface = game.surfaces[elements.surface_dropdown.items[elements.surface_dropdown.selected_index]]
+        local element = elements.surface_dropdown
+        if not element then return end
+        local surface = game.surfaces[element.items[element.selected_index]]
         local display_data = Elements.stats_table.calculate_display_data(surface.index)
         for _, stats_table in Elements.stats_table:online_elements() do
             Elements.stats_table.refresh(stats_table, display_data)