Fix include class WorkboardResponse

htdocs/index.php

@@ -383,7 +383,7 @@ if ($showweather) $boxwork.='<th class="liste_titre hideonsmartphone" width="80"
 $boxwork.='</tr>'."\n";
 
 // Do not include sections without management permission
-require DOL_DOCUMENT_ROOT.'/core/class/workboardresponse.class.php';
+require_once DOL_DOCUMENT_ROOT.'/core/class/workboardresponse.class.php';
 
 // Number of actions to do (late)
 if (! empty($conf->agenda->enabled) && $user->rights->agenda->myactions->read)