Uncaught TypeError: this.dragDirection is undefined

[gtbu]

I changed in Typesetter CMS from UI 11.4 to 13.2 and suddenly get in the pagemanager the error in sortable.js : Uncaught TypeError: this.dragDirection is undefined .
The string ' dragDirection' exists only in sortable.js 13.2 (with sortable.js v11.4 and ui 13.2 everything functions - and in sortable v11.4 exists no 'this.dragDirection' - so it must be the debugger : this.dragDirection exists 4 times in sortable.js 13.2)
Is it really undefined , and if - how can i define the Type ? --- var dragDirection =""; in line 410 has no effect ?
P.S. This error is not under Xampp but only in Web-installations.

[mgol]

Are you using the nestedSortable jQuery plugin? If so, it’s a duplicate of #1997.

[gtbu]

Yes - replacement of nested sortable 1.34 with version 2.1a solves the problem.