Plugin Not working with WordPress 4.9

I am having the same issue. I’ve updated wordpress and i am not able to change any of my custom fields with this update.

yes i get one javascript error when i inspect a page from the dashboard (ex About) then whenever i try to click a custom field i get another javascript error
these are the errors:

post.php?post=110&action=edit:672 Uncaught TypeError: Cannot read property ‘indexOf’ of undefined
at HTMLDivElement.<anonymous> (post.php?post=110&action=edit:672)
at Function.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at a.fn.init.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at a.fn.init.$.fn.init_wysiwyg (post.php?post=110&action=edit:643)
at HTMLDocument.<anonymous> (post.php?post=110&action=edit:633)
at i (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at Function.ready (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at HTMLDocument.K (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
(anonymous) @ post.php?post=110&action=edit:672
each @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2
each @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2
$.fn.init_wysiwyg @ post.php?post=110&action=edit:643
(anonymous) @ post.php?post=110&action=edit:633
i @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2
fireWith @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2
ready @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2
K @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2
load-scripts.php?c=1&load[]=hoverIntent,common,admin-bar,wp-pointer,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jquery-query,admin-c&load[]=omments,suggest,jquery-ui-mouse,jquery-ui-sortable,postbox,tags-suggest,tags-box,underscore,word-count,post,editor-expand,thickb&load[]=ox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media&load[]=-audiovideo,mce-view,imgareaselect,image-edit,svg-painter,wp-auth-check,editor,wplink,media-upload,wp-embed&ver=4.9.1:660 Uncaught TypeError: Cannot read property ‘hasClass’ of undefined
at HTMLDocument.<anonymous> (load-scripts.php?c=1&load[]=hoverIntent,common,admin-bar,wp-pointer,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jquery-query,admin-c&load[]=omments,suggest,jquery-ui-mouse,jquery-ui-sortable,postbox,tags-suggest,tags-box,underscore,word-count,post,editor-expand,thickb&load[]=ox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media&load[]=-audiovideo,mce-view,imgareaselect,image-edit,svg-painter,wp-auth-check,editor,wplink,media-upload,wp-embed&ver=4.9.1:660)
at HTMLDocument.dispatch (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:3)
at HTMLDocument.r.handle (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:3)
at Object.trigger (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:3)
at Object.a.event.trigger (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:9)
at HTMLDocument.<anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:3)
at Function.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at a.fn.init.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:2)
at a.fn.init.trigger (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-menu,wp-a11y,jquery-ui-autocomplet&load[]=e,moxiejs,plupload&ver=4.9.1:3)
at Object.<anonymous> (load-scripts.php?c=1&load[]=hoverIntent,common,admin-bar,wp-pointer,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jquery-query,admin-c&load[]=omments,suggest,jquery-ui-mouse,jquery-ui-sortable,postbox,tags-suggest,tags-box,underscore,word-count,post,editor-expand,thickb&load[]=ox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media&load[]=-audiovideo,mce-view,imgareaselect,image-edit,svg-painter,wp-auth-check,editor,wplink,media-upload,wp-embed&ver=4.9.1:5)