BuddyPress.org

Hi.
I have trouble with uploading of group avatar on my site WikiDIY.org
When I try to upload, the green bar shows the progress of the loading, but nothing happens after that.
In chrome console I have error:

underscore.min.js?ver=1.8.3:1 Uncaught SyntaxError: Unexpected identifier
at new Function (<anonymous>)
at Function.s.template (underscore.min.js?ver=1.8.3:1)
at N.d.template (wp-util.min.js?ver=5.1.1:1)
at N.d.render (wp-backbone.min.js?ver=5.1.1:1)
at wp.Backbone.Subviews.<anonymous> (wp-backbone.min.js?ver=5.1.1:1)
at underscore.min.js?ver=1.8.3:1
at Function.s.each.s.forEach (underscore.min.js?ver=1.8.3:1)
at wp.Backbone.Subviews._attach (wp-backbone.min.js?ver=5.1.1:1)
at wp.Backbone.Subviews.set (wp-backbone.min.js?ver=5.1.1:1)
at wp.Backbone.Subviews.add (wp-backbone.min.js?ver=5.1.1:1)

BuddyPress 4.2.0
Wordpress 5.1.1

Any hint how to solve it?