Backbone bug

Uncaught TypeError: _.chain(…).pluck is not a function
at wp.Backbone.Subviews._attach (wp-backbone.min.js?ver=6.1.1:2:2068)
at wp.Backbone.Subviews.set (wp-backbone.min.js?ver=6.1.1:2:884)
at wp.Backbone.Subviews.add (wp-backbone.min.js?ver=6.1.1:2:1001)
at n.initialize (buddypress-activity-post-form.min.js?ver=2.2.5:1:102651)
at h.View (backbone.min.js?ver=1.4.1:2:14648)
at n.constructor (wp-backbone.min.js?ver=6.1.1:2:2602)
at n as constructor
at new n (backbone.min.js?ver=1.4.1:2:23485)
at n.displayFull (buddypress-activity-post-form.min.js?ver=2.2.5:1:111124)
at HTMLFormElement.dispatch (jquery.min.js?ver=3.6.1:2:43064)