Error on image upload

Hi I’m getting this error when I attempt to upload an image on new testimonial:

Uncaught TypeError: Cannot read property ‘frames’ of undefined
at HTMLInputElement.<anonymous> (image-upload.js?ver=4.9.4:14)
at HTMLDocument.dispatch (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-position,jquery-ui-resizable,jquery-u&load[]=i-draggable,jquery-ui-button,jquery-ui-dialog,moxiejs,plupload&ver=4.9.4:3)
at HTMLDocument.r.handle (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-position,jquery-ui-resizable,jquery-u&load[]=i-draggable,jquery-ui-button,jquery-ui-dialog,moxiejs,plupload&ver=4.9.4:3)