Customize trouble

Hello OceanWP community,

I am facing a similar issue as described here. When I open the customizer I get the same error message as describe by @akshayshetty (see below). I did everything what is recommended, increasing the php memory, checking all updates (both wordpress and php), activating other themes (which work fine) and still I get this error. The only thing I noticed though is that if I deactivate the Blog Panel in the Theme Panel section, everything works fine.

Please help! I am using OceanWP with WordPress 3.7.13.

Uncaught TypeError: data.value.indexOf is not a function
    at eval (eval at m.template (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jqu&load[]=ery-ui-droppable,backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,utils,plupload&ver=4.7.13:14), <anonymous>:25:25)
    at Function.m.each.m.forEach (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jqu&load[]=ery-ui-droppable,backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,utils,plupload&ver=4.7.13:14)
    at eval (eval at m.template (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jqu&load[]=ery-ui-droppable,backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,utils,plupload&ver=4.7.13:14), <anonymous>:23:4)
    at c (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jqu&load[]=ery-ui-droppable,backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,utils,plupload&ver=4.7.13:14)
    at load-scripts.php?c=0&load[]=customize-base,wp-a11y,wp-util,customize-controls,wp-backbone,customize-widgets,jquery-ui-position,thickbox,jquery-ui-slider,jqu&load[]=ery-touch-punch,iris,wp-color-picker,accordion,customize-nav-menus,imgareaselect,customize-models,shortcode,media-models,wp-plup&load[]=load,mediaelement,wp-mediaelement,media-views,media-editor,customize-views,media-audiovideo,mce-view,image-edit&ver=4.7.13:3
    at f.renderContent (load-scripts.php?c=0&load[]=customize-base,wp-a11y,wp-util,customize-controls,wp-backbone,customize-widgets,jquery-ui-position,thickbox,jquery-ui-slider,jqu&load[]=ery-touch-punch,iris,wp-color-picker,accordion,customize-nav-menus,imgareaselect,customize-models,shortcode,media-models,wp-plup&load[]=load,mediaelement,wp-mediaelement,media-views,media-editor,customize-views,media-audiovideo,mce-view,image-edit&ver=4.7.13:4)
    at Object.<anonymous> (load-scripts.php?c=0&load[]=customize-base,wp-a11y,wp-util,customize-controls,wp-backbone,customize-widgets,jquery-ui-position,thickbox,jquery-ui-slider,jqu&load[]=ery-touch-punch,iris,wp-color-picker,accordion,customize-nav-menus,imgareaselect,customize-models,shortcode,media-models,wp-plup&load[]=load,mediaelement,wp-mediaelement,media-views,media-editor,customize-views,media-audiovideo,mce-view,image-edit&ver=4.7.13:4)
    at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jqu&load[]=ery-ui-droppable,backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,utils,plupload&ver=4.7.13:2)
    at Object.add [as done] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,jquery-ui-draggable,jqu&load[]=ery-ui-droppable,backbone,wp-ajax-response,jquery-color,wp-lists,postbox,nav-menu,utils,plupload&ver=4.7.13:2)
    at Function.<anonymous> (load-scripts.php?c=0&load[]=customize-base,wp-a11y,wp-util,customize-controls,wp-backbone,customize-widgets,jquery-ui-position,thickbox,jquery-ui-slider,jqu&load[]=ery-touch-punch,iris,wp-color-picker,accordion,customize-nav-menus,imgareaselect,customize-models,shortcode,media-models,wp-plup&load[]=load,mediaelement,wp-mediaelement,media-views,media-editor,customize-views,media-audiovideo,mce-view,image-edit&ver=4.7.13:4)