diff --git a/htdocs/contact/list.php b/htdocs/contact/list.php
index d165a0a4cc1..572bf85da3f 100644
--- a/htdocs/contact/list.php
+++ b/htdocs/contact/list.php
@@ -1222,7 +1222,7 @@ while ($i < min($num, $limit)) {
 	if (isModEnabled('socialnetworks')) {
 		foreach ($socialnetworks as $key => $value) {
 			if ($value['active'] && !empty($arrayfields['p.'.$key]['checked'])) {
-				print '<td class="tdoverflowmax100">'.dol_print_socialnetworks($arraysocialnetworks[$key], $obj->rowid, $obj->socid, $key, $socialnetworks).'</td>';
+				print '<td class="tdoverflowmax100">'.(empty($arraysocialnetworks[$key]) ? '' : dol_print_socialnetworks($arraysocialnetworks[$key], $obj->rowid, $obj->socid, $key, $socialnetworks)).'</td>';
 				if (!$i) {
 					$totalarray['nbfield']++;
 				}
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index d145358d62f..bb8e2e3b77b 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -3256,7 +3256,7 @@ function dol_print_phone($phone, $countrycode = '', $cid = 0, $socid = 0, $addli
 	global $conf, $user, $langs, $mysoc, $hookmanager;
 
 	// Clean phone parameter
-	$phone = preg_replace("/[\s.-]/", "", trim($phone));
+	$phone = is_null($phone) ? '' : preg_replace("/[\s.-]/", "", trim($phone));
 	if (empty($phone)) {
 		return '';
 	}
diff --git a/htdocs/index.php b/htdocs/index.php
index 97b82fb93ba..f9ca18f530a 100644
--- a/htdocs/index.php
+++ b/htdocs/index.php
@@ -558,7 +558,7 @@ if (empty($conf->global->MAIN_DISABLE_GLOBAL_WORKBOARD)) {
 					}
 
 					$textLateTitle = $langs->trans("NActionsLate", $board->nbtodolate);
-					$textLateTitle .= ' ('.$langs->trans("Late").' = '.$langs->trans("DateReference").' > '.$langs->trans("DateToday").' '.(ceil($board->warning_delay) >= 0 ? '+' : '').ceil($board->warning_delay).' '.$langs->trans("days").')';
+					$textLateTitle .= ' ('.$langs->trans("Late").' = '.$langs->trans("DateReference").' > '.$langs->trans("DateToday").' '.(ceil(empty($board->warning_delay) ? 0 : $board->warning_delay) >= 0 ? '+' : '').ceil(empty($board->warning_delay) ? 0 : $board->warning_delay).' '.$langs->trans("days").')';
 
 					if ($board->id == 'bank_account') {
 						$textLateTitle .= '<br><span class="opacitymedium">'.$langs->trans("IfYouDontReconcileDisableProperty", $langs->transnoentitiesnoconv("Conciliable")).'</span>';