diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index 9b76329d8dada..af903637e6f94 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -138,13 +138,13 @@
 if ($action == 'default') {	// When action is default, we want a calendar view and not the list
 	$action = (($defaultview != 'show_list') ? $defaultview : 'show_month');
 }
-if (GETPOST('viewcal', 'restricthtml') && GETPOST('action', 'alpha') != 'show_day' && GETPOST('action', 'alpha') != 'show_week') {
+if (GETPOST('viewcal', 'int') && GETPOST('action', 'alpha') != 'show_day' && GETPOST('action', 'alpha') != 'show_week') {
 	$action = 'show_month'; $day = '';
 } // View by month
-if (GETPOST('viewweek', 'restricthtml') || GETPOST('action', 'alpha') == 'show_week') {
+if (GETPOST('viewweek', 'int') || GETPOST('action', 'alpha') == 'show_week') {
 	$action = 'show_week'; $week = ($week ? $week : date("W")); $day = ($day ? $day : date("d"));
 } // View by week
-if (GETPOST('viewday', 'restricthtml') || GETPOST('action', 'alpha') == 'show_day') {
+if (GETPOST('viewday', 'int') || GETPOST('action', 'alpha') == 'show_day') {
 	$action = 'show_day'; $day = ($day ? $day : date("d"));
 } // View by day
 
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 60ffa14b75da3..2d5602813941b 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -779,7 +779,7 @@ function checkVal($out = '', $check = 'alphanohtml', $filter = null, $options =
 			do {
 				$oldstringtoclean = $out;
 
-				if (!empty($conf->global->MAIN_RESTRICTHTML_ONLY_VALID_HTML) && $check != 'restricthtmlallowunvalid') {
+				if (!empty($out) && !empty($conf->global->MAIN_RESTRICTHTML_ONLY_VALID_HTML) && $check != 'restricthtmlallowunvalid') {
 					try {
 						$dom = new DOMDocument;
 						$dom->loadHTML($out, LIBXML_ERR_NONE|LIBXML_HTML_NOIMPLIED|LIBXML_HTML_NODEFDTD|LIBXML_NONET|LIBXML_NOWARNING|LIBXML_NOXMLDECL);