diff --git a/src/Action.php b/src/Action.php
index 5225f54..7a0a30c 100644
--- a/src/Action.php
+++ b/src/Action.php
@@ -38,7 +38,7 @@ class Action
         ?callable $function
     ) {
         // fake action has no behavior
-        if (null !== $function) {
+        if (!is_null($function)) {
             dcCore::app()->addBehavior($behavior, $function);
         }
     }
diff --git a/src/ActivityReport.php b/src/ActivityReport.php
index 030d062..a9a595e 100644
--- a/src/ActivityReport.php
+++ b/src/ActivityReport.php
@@ -104,7 +104,7 @@ class ActivityReport
      */
     public function getLogs(ArrayObject $params = null, bool $count_only = false, ?SelectStatement $ext_sql = null): ?dcRecord
     {
-        if (null === $params) {
+        if (is_null($params)) {
             $params = new ArrayObject();
         }
 
@@ -598,7 +598,7 @@ class ActivityReport
                 ]);
 
                 $logs = $this->getLogs($params);
-                if ($logs !== null && !$logs->isEmpty()) {
+                if (!is_null($logs) && !$logs->isEmpty()) {
                     // Datas to readable text
                     $content = $this->parseLogs($logs);
                     if (!empty($content)) {
diff --git a/src/Settings.php b/src/Settings.php
index 21136e5..e8620f4 100644
--- a/src/Settings.php
+++ b/src/Settings.php
@@ -51,7 +51,7 @@ class Settings
      */
     public function __construct()
     {
-        if (dcCore::app()->blog === null) {
+        if (is_null(dcCore::app()->blog)) {
             throw new Exception('Blog is not set');
         }