Upload Screen Blank on Medialibary after Update to WP 5.3 (Log Inside)

Hey Guys and Girls…

I have a little but annoying problem. Since the Update to WP5.3 the Upload Tab from the Media Libary is blank. But only if call it from a Event Editing or if i edit the Feature Image. (If i access Upload directly from the Menu it works).

The Chrome Console shows the following error if it try to click on the blank Tab:

load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils&ver=5.3:8 JQMIGRATE: Migrate is installed, version 1.4.1
load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418 Uncaught TypeError: Cannot convert undefined or null to object
at g.cleanup (load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418)
at g.off (load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418)
at r (load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418)
at l (load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418)
at h.Collection.n.off (load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418)
at i.<computed> [as off] (media-views.min.js?ver=5.3:1)
at i.dispose (media-views.min.js?ver=5.3:1)
at i.dispose (media-views.min.js?ver=5.3:1)
at i.remove (media-views.min.js?ver=5.3:1)
at load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:73
g.cleanup @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
g.off @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
r @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
l @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
n.off @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
i.<computed> @ media-views.min.js?ver=5.3:1
dispose @ media-views.min.js?ver=5.3:1
dispose @ media-views.min.js?ver=5.3:1
remove @ media-views.min.js?ver=5.3:1
(anonymous) @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:73
v.map.v.collect @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:73
v.invoke @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:73
remove @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:420
remove @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:420
remove @ media-views.min.js?ver=5.3:1
(anonymous) @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:420
v.each.v.forEach @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:73
set @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:420
set @ media-views.min.js?ver=5.3:1
uploadContent @ media-views.min.js?ver=5.3:1
p @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
f @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
l @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
n.trigger @ load-scripts.php?c=0&load[chunk_0]=jquery-ui-sortable,postbox,hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jque&load[chunk_1]=ry-query,admin-comments,suggest,jquery-ui-position,jquery-ui-menu,jquery-ui-autocomplete,tags-suggest,tags-box,underscore,word-c&load[chunk_2]=ount,wp-sanitize,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,media-models,wp-plupload&ver=5.3:418
i.<computed> @ media-views.min.js?ver=5.3:1
trigger @ media-views.min.js?ver=5.3:1
render @ media-views.min.js?ver=5.3:1
mode @ media-views.min.js?ver=5.3:1
click @ media-views.min.js?ver=5.3:1
_click @ media-views.min.js?ver=5.3:1
dispatch @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils&ver=5.3:3
r.handle @ load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,utils&ver=5.3:3
Show 2 more frames

What is this? If i deactivate ALL Plugins it’s still happening, if i switch to Standard-Theme it’s working. But how a Theme is able to corupt this load-scripts.php?

Thanks in advance

Kindly Regards

Marcel