diff --git a/php/domain-validator.php b/php/domain-validator.php
index a1e6487b..8f4fca11 100644
--- a/php/domain-validator.php
+++ b/php/domain-validator.php
@@ -8,7 +8,7 @@ if (strpos($domain, '.') === false) {
     http_response_code(400);  
 } elseif (strpos($domain, ':') !== false) { 
     http_response_code(400);  
-} elseif (!filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)) { 
+} elseif (!filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME) === false) { 
     http_response_code(400); 
 } elseif (filter_var($domain, FILTER_VALIDATE_IP)) { 
     http_response_code(400); 
diff --git a/php/psalm-baseline.xml b/php/psalm-baseline.xml
index efff0560..19d94ff7 100644
--- a/php/psalm-baseline.xml
+++ b/php/psalm-baseline.xml
@@ -1,2 +1,2 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="5.19.0@06b71be009a6bd6d81b9811855d6629b9fe90e1b"/>
+<files psalm-version="5.20.0@3f284e96c9d9be6fe6b15c79416e1d1903dcfef4"/>
diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index 51780b35..3b3cba5d 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -286,7 +286,7 @@ class ConfigurationManager
         }
 
         // Validate domain
-        if (!filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)) {
+        if (filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME) === false) {
             throw new InvalidSettingConfigurationException("Domain is not a valid domain!");
         }
 
@@ -305,7 +305,7 @@ class ConfigurationManager
 
             if (empty($dnsRecordIP)) {
                 $record = dns_get_record($domain, DNS_AAAA);
-                if (!empty($record)) {
+                if (!empty($record[0]['ipv6'])) {
                     $dnsRecordIP = $record[0]['ipv6'];
                 }
             }