Issue #2988182 by greenskin: Error: Call to undefined method optionsForm() in _quicktabs_form()

quicktabs.admin.inc

@@ -317,7 +317,7 @@ function _quicktabs_form(array $tab, $qt) {
     }
     $tabtypes[$name] = $name;
     $content_provider = quick_content_factory($name, $tab);
-    if (is_object($content_provider)) {
+    if (is_object($content_provider) && method_exists($content_provider, 'optionsForm')) {
       $form = array_merge_recursive($form, $content_provider->optionsForm($delta, $qt));
     }
   }