avia layout Cell insert Custom Background Image does not function

I have created a 3 cells grid-row…
I wish to insert a background image to each.
Chrome console gives the following error when I press the Insert Image for Custom Background Image:

wp-auth-check.min.js?ver=4.9.5:1 Uncaught TypeError: Cannot read property 'hasClass' of undefined
    at HTMLDocument.<anonymous> (wp-auth-check.min.js?ver=4.9.5:1)
    at HTMLDocument.dispatch (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:3)
    at HTMLDocument.r.handle (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:3)
    at Object.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:3)
    at Object.a.event.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:9)
    at HTMLDocument.<anonymous> (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:3)
    at Function.each (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:2)
    at a.fn.init.each (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:2)
    at a.fn.init.trigger (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,underscore,jquery-ui-widget,jquery-ui-position,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,jque&load[]=ry-ui-draggable,utils,backbone,wp-util,moxiejs,plupload&ver=4.9.5:3)
    at Object.<anonymous> (heartbeat.min.js?ver=4.9.5:1)

What is wrong??
What’s the fix for this??
Thank you