This addon completely breaks derma_controls

[Astralcircle]

[Tank Track Tool] lua/tanktracktool/client/derma/editor/editor.lua:311: attempt to compare nil with number
    1. OnNodeAdded - lua/tanktracktool/client/derma/editor/editor.lua:311
        2. OnNodeAdded - lua/tanktracktool/client/derma/editor/node_category.lua:62
            3. AddNode - lua/tanktracktool/client/derma/editor/node.lua:117
                4. AddNode - lua/tanktracktool/client/derma/editor/node_category.lua:51
                    5. GenerateExample - lua/vgui/dtree.lua:124
                        6. Init - lua/derma/derma_example.lua:20
                            7. CreateFromTable - lua/includes/extensions/client/panel/scriptedpanels.lua:65
                                8. unknown - lua/derma/derma_example.lua:53
                                    9. unknown - lua/includes/modules/concommand.lua:54