pltVars is not defined

The plugin throws the following error in WordPress 4.9.10:

quick-add.jsx:15 Uncaught ReferenceError: pltVars is not defined
    at HTMLDocument.<anonymous> (quick-add.jsx:15)
    at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,shortcode,utils,me&load[]=dia-models,moxiejs,plupload,wp-plupload&ver=4.9.10:2)
    at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,shortcode,utils,me&load[]=dia-models,moxiejs,plupload,wp-plupload&ver=4.9.10:2)
    at Function.ready (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,shortcode,utils,me&load[]=dia-models,moxiejs,plupload,wp-plupload&ver=4.9.10:2)
    at HTMLDocument.K (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,wp-a11y,wp-util,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-&load[]=ui-draggable,jquery-ui-droppable,backbone,wp-backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,shortcode,utils,me&load[]=dia-models,moxiejs,plupload,wp-plupload&ver=4.9.10:2)