Conflict with module Ninja form

Hello,

I have a conflic with the module ninja form.
I have a function that recovers the value of a select but this does not work :

 jQuery( document ).ready( function( $ ) {
                var jBox = jQuery( '.nf-insert-form' ).jBox( 'Modal', {
                    title: 'Insert Form',
                    position: {
                        x: 'center',
                        y: 'center'
                    },
                    closeButton: 'title',
                    closeOnClick: 'overlay',
                    closeOnEsc: true,
                    // theme: 'TooltipBorder',
                    content: jQuery( '#nf-insert-form-modal' ),
                    onOpen: function() {
                        jQuery( '.nf-forms-combobox' ).combobox();
                        jQuery( this )[0].content.find( '.ui-autocomplete-input' ).attr( 'placeholder', 'Select a form or type to search' );
                        jQuery( this )[0].content.css( 'overflow', 'visible' );
                        jQuery( this )[0].content.find( '.ui-icon-triangle-1-s' ).addClass( 'dashicons dashicons-arrow-down' ).css( 'margin-left', '-7px' );
                    },
                    onClose: function() {
                        jQuery( '.nf-forms-combobox' ).combobox( 'destroy'  );
                    }
                });

                jQuery( document ).on( 'click', '#nf-insert-form', function( e ) {
                    e.preventDefault();
                    var form_id = jQuery( '#nf-form-select' ).val();
                    var shortcode = '[ninja_form id=' + form_id + ']';
                    window.parent.send_to_editor( shortcode );
                    jBox.close();
                    jQuery( '#nf-form-select' ).val( '' );
                } );
            } );

Can you help me to correct this problem ?

Thanks you