this error
select2(‘destroy’) method was called on an element that is not using Select2
can track to acf-input.js file and there
at line 10337 is
if( !this.$select.exists() || !this.o.ui) {...
according to this stackoverflow simplest way is to check if this element is select2 object.
http://stackoverflow.com/questions/38797207/how-to-handle-the-select2destroy-method-was-called-on-an-element-that-is-n
so changing this line to
if( !this.$select.exists() || !this.o.ui) || !this.$select.data('select2') {...
fix problem for me
