Drupal modal form save data twice
I found solution.
In the file 


  modal_forms.pages.inc


inside the function modal_forms_view_webform($js = NULL, $node) place $form_state['rebuild'] = TRUE; after $output = ctools_modal_form_wrapper('webform_client_form_' . $node-&gt;nid, $form_state);

Then modal form will save data only once.