diff --git a/htdocs/core/ajax/check_notifications.php b/htdocs/core/ajax/check_notifications.php
index 346b17e3288..77245c22494 100644
--- a/htdocs/core/ajax/check_notifications.php
+++ b/htdocs/core/ajax/check_notifications.php
@@ -75,7 +75,7 @@ if ($time >= $_SESSION['auto_check_events_not_before'])
     require_once DOL_DOCUMENT_ROOT.'/comm/action/class/actioncomm.class.php';
 
 
-    dol_syslog('NEW $_SESSION[auto_check_events_not_before]='.$_SESSION['auto_check_events_not_before']);
+    dol_syslog('NEW $_SESSION[auto_check_events_not_before]='.(empty($_SESSION['auto_check_events_not_before']) ? '' : $_SESSION['auto_check_events_not_before']));
 
     $sql = 'SELECT id';
     $sql .= ' FROM ' . MAIN_DB_PREFIX . 'actioncomm a, ' . MAIN_DB_PREFIX . 'actioncomm_resources ar';
diff --git a/htdocs/core/lib/security2.lib.php b/htdocs/core/lib/security2.lib.php
index 18d1e9c680a..aa53a5b71d7 100644
--- a/htdocs/core/lib/security2.lib.php
+++ b/htdocs/core/lib/security2.lib.php
@@ -467,15 +467,18 @@ function getRandomPassword($generic = false, $replaceambiguouschars = null, $len
 		{
 			$max = strlen($lowercase) - 1;
 			for ($x = 0; $x < $nbofchar; $x++) {
-				$randomCode .= $lowercase{random_int(0, $max)};
+				$tmp = random_int(0, $max);
+				$randomCode .= $lowercase[$tmp];
 			}
 			$max = strlen($uppercase) - 1;
 			for ($x = 0; $x < $nbofchar; $x++) {
-				$randomCode .= $uppercase{random_int(0, $max)};
+				$tmp = random_int(0, $max);
+				$randomCode .= $uppercase[$tmp];
 			}
 			$max = strlen($numbers) - 1;
 			for ($x = 0; $x < $nbofcharlast; $x++) {
-				$randomCode .= $numbers{random_int(0, $max)};
+				$tmp = random_int(0, $max);
+				$randomCode .= $numbers[$tmp];
 			}
 
 			$generated_password=str_shuffle($randomCode);
@@ -484,15 +487,18 @@ function getRandomPassword($generic = false, $replaceambiguouschars = null, $len
 		{
 			$max = strlen($lowercase) - 1;
 			for ($x = 0; $x < $nbofchar; $x++) {
-				$randomCode .= $lowercase{mt_rand(0, $max)};
+				$tmp = mt_rand(0, $max);
+				$randomCode .= $lowercase[$tmp];
 			}
 			$max = strlen($uppercase) - 1;
 			for ($x = 0; $x < $nbofchar; $x++) {
-				$randomCode .= $uppercase{mt_rand(0, $max)};
+				$tmp = mt_rand(0, $max);
+				$randomCode .= $uppercase[$tmp];
 			}
 			$max = strlen($numbers) - 1;
 			for ($x = 0; $x < $nbofcharlast; $x++) {
-				$randomCode .= $numbers{mt_rand(0, $max)};
+				$tmp = mt_rand(0, $max);
+				$randomCode .= $numbers[$tmp];
 			}
 
 			$generated_password=str_shuffle($randomCode);
@@ -516,11 +522,13 @@ function getRandomPassword($generic = false, $replaceambiguouschars = null, $len
 		$max = strlen($numbers) - 1;
 		if (function_exists('random_int'))	// Cryptographic random
 		{
-			$generated_password=str_replace($replaceambiguouschars, $numbers{random_int(0, $max)}, $generated_password);
+			$tmp = random_int(0, $max);
+			$generated_password=str_replace($replaceambiguouschars, $numbers[$tmp], $generated_password);
 		}
 		else
 		{
-			$generated_password=str_replace($replaceambiguouschars, $numbers{mt_rand(0, $max)}, $generated_password);
+			$tmp = random_int(0, $max);
+			$generated_password=str_replace($replaceambiguouschars, $numbers[$tmp], $generated_password);
 		}
 	}