diff --git a/htdocs/core/ajax/pingresult.php b/htdocs/core/ajax/pingresult.php
index 4398a3e8d4c..fa7f4d0e68b 100644
--- a/htdocs/core/ajax/pingresult.php
+++ b/htdocs/core/ajax/pingresult.php
@@ -67,14 +67,14 @@ print '<!-- Ajax page called with url '.dol_escape_htmltag($_SERVER["PHP_SELF"])
 if ($action == 'firstpingok') {
 	// Note: pings are per installed instances / entity.
 	// Once this constants are set, no more ping will be tried (except if we add parameter &forceping=1 on URL). So we can say this are 'first' ping.
-	dolibarr_set_const($db, 'MAIN_FIRST_PING_OK_DATE', dol_print_date($now, 'dayhourlog', 'gmt'));
-	dolibarr_set_const($db, 'MAIN_FIRST_PING_OK_ID', $hash_unique_id);
+	dolibarr_set_const($db, 'MAIN_FIRST_PING_OK_DATE', dol_print_date($now, 'dayhourlog', 'gmt'), 'chaine', 0, '', $conf->entity);
+	dolibarr_set_const($db, 'MAIN_FIRST_PING_OK_ID', $hash_unique_id, 'chaine', 0, '', $conf->entity);
 
 	print 'First ping OK saved for entity '.$conf->entity;
 } elseif ($action == 'firstpingko') {
 	// If ko
 	// Note: pings are by installation, done on entity 1.
-	dolibarr_set_const($db, 'MAIN_LAST_PING_KO_DATE', dol_print_date($now, 'dayhourlog'), 'gmt'); // erase last value
+    dolibarr_set_const($db, 'MAIN_LAST_PING_KO_DATE', dol_print_date($now, 'dayhourlog', 'gmt'), 'chaine', 0, '', $conf->entity); // erase last value
 	print 'First ping KO saved for entity '.$conf->entity;
 } else {
 	print 'Error action='.$action.' not supported';
diff --git a/htdocs/core/boxes/box_services_contracts.php b/htdocs/core/boxes/box_services_contracts.php
index 43f5babcf04..b6eb51826cc 100644
--- a/htdocs/core/boxes/box_services_contracts.php
+++ b/htdocs/core/boxes/box_services_contracts.php
@@ -60,7 +60,7 @@ class box_services_contracts extends ModeleBoxes
 
 		$this->db = $db;
 
-		$this->hidden = !($user->rights->service->lire && $user->rights->contrat->lire);
+		$this->hidden = !(!empty($user->rights->service->lire) && !empty($user->rights->contrat->lire));
 	}
 
 	/**
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index f6376a650b7..1001eccf78f 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1,10 +1,10 @@
 <?php
 /* Copyright (C) 2002-2007  Rodolphe Quiedeville    <rodolphe@quiedeville.org>
  * Copyright (C) 2003       Xavier Dutoit           <doli@sydesy.com>
- * Copyright (C) 2004-2015  Laurent Destailleur     <eldy@users.sourceforge.net>
+ * Copyright (C) 2004-2021  Laurent Destailleur     <eldy@users.sourceforge.net>
  * Copyright (C) 2004       Sebastien Di Cintio     <sdicintio@ressource-toi.org>
  * Copyright (C) 2004       Benoit Mortier          <benoit.mortier@opensides.be>
- * Copyright (C) 2005-2015  Regis Houssin           <regis.houssin@inodbox.com>
+ * Copyright (C) 2005-2021  Regis Houssin           <regis.houssin@inodbox.com>
  * Copyright (C) 2011-2014  Philippe Grand          <philippe.grand@atoo-net.com>
  * Copyright (C) 2008       Matteli
  * Copyright (C) 2011-2016  Juanjo Menent           <jmenent@2byte.es>
@@ -1420,7 +1420,7 @@ function top_htmlhead($head, $title = '', $disablejs = 0, $disablehead = 0, $arr
 		}
 
 		$themeparam = '?lang='.$langs->defaultlang.'&amp;theme='.$conf->theme.(GETPOST('optioncss', 'aZ09') ? '&amp;optioncss='.GETPOST('optioncss', 'aZ09', 1) : '').'&amp;userid='.$user->id.'&amp;entity='.$conf->entity;
-		$themeparam .= ($ext ? '&amp;'.$ext : '').'&amp;revision='.$conf->global->MAIN_IHM_PARAMS_REV;
+		$themeparam .= ($ext ? '&amp;'.$ext : '').'&amp;revision='.(empty($conf->global->MAIN_IHM_PARAMS_REV) ? '0' : $conf->global->MAIN_IHM_PARAMS_REV);
 		if (!empty($_SESSION['dol_resetcache'])) {
 			$themeparam .= '&amp;dol_resetcache='.$_SESSION['dol_resetcache'];
 		}
@@ -3090,7 +3090,7 @@ if (!function_exists("llxFooter")) {
 					} else {
 						include_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
 
-						print "\n".'<!-- Includes JS for Ping of Dolibarr forceping='.$forceping.' MAIN_FIRST_PING_OK_DATE='.$conf->global->MAIN_FIRST_PING_OK_DATE.' MAIN_FIRST_PING_OK_ID='.$conf->global->MAIN_FIRST_PING_OK_ID.' MAIN_LAST_PING_KO_DATE='.$conf->global->MAIN_LAST_PING_KO_DATE.' -->'."\n";
+						print "\n".'<!-- Includes JS for Ping of Dolibarr forceping='.$forceping.' MAIN_FIRST_PING_OK_DATE='.(empty($conf->global->MAIN_FIRST_PING_OK_DATE) ? '' : $conf->global->MAIN_FIRST_PING_OK_DATE).' MAIN_FIRST_PING_OK_ID='.(empty($conf->global->MAIN_FIRST_PING_OK_ID) ? '' : $conf->global->MAIN_FIRST_PING_OK_ID).' MAIN_LAST_PING_KO_DATE='.(empty($conf->global->MAIN_LAST_PING_KO_DATE) ? '' : $conf->global->MAIN_LAST_PING_KO_DATE).' -->'."\n";
 						print "\n<!-- JS CODE TO ENABLE the anonymous Ping -->\n";
 						$url_for_ping = (empty($conf->global->MAIN_URL_FOR_PING) ? "https://ping.dolibarr.org/" : $conf->global->MAIN_URL_FOR_PING);
 						// Try to guess the distrib used