Adds getter for field ID

assets/js/src/form/fields/selection.jsx

@@ -41,6 +41,10 @@ define([
         this.destroySelect2();
       }
     },
+    getFieldId: function (data) {
+      const props = data || this.props;
+      return props.field.id || props.field.name;
+    },
     destroySelect2: function () {
       if (this.isSelect2Initialized()) {
         jQuery(`#${this.refs.select.id}`).select2('destroy');
@@ -215,7 +219,7 @@ define([
 
       return (
         <select
-          id={this.props.field.id || this.props.field.name}
+          id={this.getFieldId()}
           ref="select"
           disabled={this.props.field.disabled}
           data-placeholder={this.props.field.placeholder}