bug fixe on newsletter templating

web/modules/custom/materio_simplenews/materio_simplenews.module

@@ -17,9 +17,10 @@ function materio_simplenews_form_node_simplenews_issue_form_alter(&$form, &$form
     if(in_array($news_id, $newsletters)){
     
       // prepopulate type of news
-      $form['simplenews_issue']['widget']['target_id']['#default_value'] = [$news_id];
+      $form['simplenews_issue']['widget']['target_id']['#default_value'] = $news_id;
       $form['simplenews_issue']['widget']['target_id']['#disabled'] = true;
-      
+      unset($form['simplenews_issue']['widget']['target_id']['#ajax']);
+
       // change default template regarding type of news
       $form['body']['widget'][0]['#default_value'] = materio_simplenews_getSimplenewsNodeBodyTemplate($news_id);
       $form['body']['widget'][0]['#rows'] = 50;
@@ -30,4 +31,10 @@ function materio_simplenews_form_node_simplenews_issue_form_alter(&$form, &$form
 
 function materio_simplenews_getSimplenewsNodeBodyTemplate($news_id){
   return file_get_contents(drupal_get_path('module', 'materio_simplenews').'/templates/simplenews_'.$news_id.'_node.html');
+}
+
+function materio_simplenews_form_node_simplenews_issue_edit_form_alter(&$form, &$form_state, $form_id) {
+  $default = $form['simplenews_issue']['widget']['target_id']['#default_value'];
+  $form['simplenews_issue']['widget']['target_id']['#default_value'] = $default[0];
+  $form['simplenews_issue']['widget']['target_id']['#disabled'] = true;
 }