Another weird bug – everything disappears in customize immediately

>Appearance >Customize produces a menu containing the new options for the two side bars in this theme [NASH|GuuThemes], the menu selector moves up and down but none of the menu items are selectable and the content which should be in the right hand panel is completely absent. In fact it seems to slow the whole site down. Its like its running in slomo.

https://www.ads-software.com/plugins/widget-customizer/