Error: Object Invalid with selectedTabPanel when i close window panel.

I have a problem when i Close my Panel Window in after effects, send me to the ESTK window with an error in case: "OpenTag": Saying that is Object Invalid.

So the script is working to set dropdown menus to the 0 selection, but if some dropdown is in other selection, and close my window panel got that error.

I have the next code:

 myPanel.grp.myTabbedPanel.onChange = function(){     var selectedTab = myPanel.grp.myTabbedPanel;    if(!selectedTab || !selectedTab.selection) return;    switch(selectedTab.selection.text){          case "Salidas":     //If Salidas was clicked...                             myPanel.grp.myTabbedPanel.myTab1.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab2.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab3.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab6.layoutGrp.ddLayout.selection = 0              break;          case "Plecas":     //If Plecas was clicked...                     myPanel.grp.myTabbedPanel.myTab1.layoutGrp.ddLayout.selection = 0                     myPanel.grp.myTabbedPanel.myTab3.layoutGrp.ddLayout.selection = 0                     myPanel.grp.myTabbedPanel.myTab6.layoutGrp.ddLayout.selection = 0                     myPanel.grp.myTabbedPanel.myTab4.ddLayout.selection = 0                                 break;                       case "OpenTag":     //If Plecas was clicked...                    myPanel.grp.myTabbedPanel.myTab2.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab3.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab6.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab4.ddLayout.selection = 0                             break;                   case "Cintillo":     //If Plecas was clicked...                    myPanel.grp.myTabbedPanel.myTab1.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab2.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab6.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab4.ddLayout.selection = 0                                                break;                            case "Menu":     //If Plecas was clicked...                    myPanel.grp.myTabbedPanel.myTab1.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab2.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab3.layoutGrp.ddLayout.selection = 0                    myPanel.grp.myTabbedPanel.myTab4.ddLayout.selection = 0                                                break;          //and so on for the other tabs you have.                   default:          alert("not detected");          break;              }
}