diff --git a/src/Ltb/Directory/ActiveDirectory.php b/src/Ltb/Directory/ActiveDirectory.php
index be9a4c0..b9bf153 100644
--- a/src/Ltb/Directory/ActiveDirectory.php
+++ b/src/Ltb/Directory/ActiveDirectory.php
@@ -21,7 +21,7 @@ public function isLocked($ldap, $dn, $config) : bool {
         }
 
         # Get lockoutTime
-        $lockoutTime = $entry[0]['lockouttime'][0];
+        $lockoutTime = $entry[0]['lockouttime'][0] ?? 0;
 
         # Get unlock date
         $unlockDate = $this->getUnlockDate($ldap, $dn, $config);
@@ -53,7 +53,7 @@ public function getLockDate($ldap, $dn) : ?DateTime {
         }
 
         # Get lockoutTime
-        $lockoutTime = $entry[0]['lockouttime'][0];
+        $lockoutTime = $entry[0]['lockouttime'][0] ?? 0;
 
         if ( !$lockoutTime or $lockoutTime === 0) {
             return $lockDate;
@@ -119,7 +119,7 @@ public function isPasswordExpired($ldap, $dn, $config) : bool {
         }
 
         # Get pwdLastSet
-        $pwdLastSet = $entry[0]['pwdlastset'][0];
+        $pwdLastSet = $entry[0]['pwdlastset'][0] ?? null;
 
         if (!$pwdLastSet) {
             return false;
@@ -155,7 +155,7 @@ public function getPasswordExpirationDate($ldap, $dn, $config) : ?DateTime {
         }
 
         # Get pwdLastSet
-        $pwdLastSet = $entry[0]['pwdlastset'][0];
+        $pwdLastSet = $entry[0]['pwdlastset'][0] ?? null;
 
         if ( !$pwdLastSet or $pwdLastSet === 0) {
             return $expirationDate;
@@ -206,7 +206,8 @@ public function resetAtNextConnection($ldap, $dn) : bool {
             $entry = \Ltb\PhpLDAP::ldap_get_entries($ldap, $search);
         }
 
-        if ($entry[0]['pwdlastset'] and $entry[0]['pwdlastset'][0] === 0) {
+        $pwdlastset = $entry[0]['pwdlastset'][0] ?? null;
+        if ( isset($pwdlastset) and $pwdlastset === 0) {
             return true;
         } else {
             return false;
@@ -312,8 +313,10 @@ public function getPwdPolicyConfiguration($ldap, $entry_dn, $default_ppolicy_dn)
         }
 
         $ppolicyConfig["dn"] = $entry[0]["dn"];
-        $ppolicyConfig["lockout_duration"] = $entry[0]["lockoutduration"][0] / -10000000 ;
-        $ppolicyConfig["password_max_age"] = $entry[0]["maxpwdage"][0] / -10000000;
+        $lockoutduration = $entry[0]["lockoutduration"][0] ?? 0;
+        $ppolicyConfig["lockout_duration"] = $lockoutduration / -10000000 ;
+        $password_max_age = $entry[0]["maxpwdage"][0] ?? 0;
+        $ppolicyConfig["password_max_age"] = $password_max_age / -10000000;
         $ppolicyConfig["lockout_enabled"] = false;
 
         return $ppolicyConfig;
diff --git a/src/Ltb/Directory/OpenLDAP.php b/src/Ltb/Directory/OpenLDAP.php
index b8f6fb4..952d40c 100644
--- a/src/Ltb/Directory/OpenLDAP.php
+++ b/src/Ltb/Directory/OpenLDAP.php
@@ -20,7 +20,7 @@ public function isLocked($ldap, $dn, $config) : bool {
         }
 
         # Get pwdAccountLockedTime
-        $pwdAccountLockedTime = $entry[0]['pwdaccountlockedtime'][0];
+        $pwdAccountLockedTime = $entry[0]['pwdaccountlockedtime'][0] ?? null;
 
         if (!$pwdAccountLockedTime) {
             return false;
@@ -55,7 +55,7 @@ public function getLockDate($ldap, $dn) : ?DateTime {
         }
 
         # Get pwdAccountLockedTime
-        $pwdAccountLockedTime = $entry[0]['pwdaccountlockedtime'][0];
+        $pwdAccountLockedTime = $entry[0]['pwdaccountlockedtime'][0] ?? null;
 
         if (!$pwdAccountLockedTime or $pwdAccountLockedTime === "000001010000Z") {
             return $lockDate;
@@ -127,7 +127,7 @@ public function isPasswordExpired($ldap, $dn, $config) : bool {
         }
 
         # Get pwdChangedTime
-        $pwdChangedTime = $entry[0]['pwdchangedtime'][0];
+        $pwdChangedTime = $entry[0]['pwdchangedtime'][0] ?? null;
 
         if (!$pwdChangedTime) {
             return false;
@@ -163,7 +163,7 @@ public function getPasswordExpirationDate($ldap, $dn, $config) : ?DateTime {
         }
 
         # Get pwdChangedTime
-        $pwdChangedTime = $entry[0]['pwdchangedtime'][0];
+        $pwdChangedTime = $entry[0]['pwdchangedtime'][0] ?? null;
 
         if (!$pwdChangedTime) {
             return $expirationDate;
@@ -213,7 +213,8 @@ public function resetAtNextConnection($ldap, $dn) : bool {
             $entry = \Ltb\PhpLDAP::ldap_get_entries($ldap, $search);
         }
 
-        if ($entry[0]['pwdreset'] and $entry[0]['pwdreset'][0] === "TRUE") {
+        $pwdreset = $entry[0]['pwdreset'][0] ?? null;
+        if( isset($pwdreset) and $pwdreset === "TRUE" ) {
             return true;
         } else {
             return false;
@@ -307,9 +308,10 @@ public function getPwdPolicyConfiguration($ldap, $entry_dn, $default_ppolicy_dn)
         }
 
         $ppolicyConfig["dn"] = $entry[0]["dn"];
-        $ppolicyConfig["lockout_duration"] = $entry[0]["pwdlockoutduration"][0];
-        $ppolicyConfig["password_max_age"] = $entry[0]["pwdmaxage"][0];
-        $ppolicyConfig["lockout_enabled"] = strtolower($entry[0]['pwdlockout'][0]) == "true" ? true : false;
+        $ppolicyConfig["lockout_duration"] = $entry[0]["pwdlockoutduration"][0] ?? 0;
+        $ppolicyConfig["password_max_age"] = $entry[0]["pwdmaxage"][0] ?? 0;
+        $pwdlockout = $entry[0]['pwdlockout'][0] ?? false;
+        $ppolicyConfig["lockout_enabled"] = strtolower($pwdlockout) == "true" ? true : false;
 
         return $ppolicyConfig;
     }