diff --git a/rector.php b/rector.php
index ab3d069b..50a29492 100644
--- a/rector.php
+++ b/rector.php
@@ -9,6 +9,7 @@
 use Rector\Php81\Rector\Array_\FirstClassCallableRector;
 use Rector\Set\ValueObject\LevelSetList;
 use Rector\Set\ValueObject\SetList;
+use Rector\Strict\Rector\BooleanNot\BooleanInBooleanNotRuleFixerRector;
 
 return static function (RectorConfig $rectorConfig): void {
     $rectorConfig->sets([
@@ -19,6 +20,7 @@
         SetList::NAMING,
         SetList::PRIVATIZATION,
         SetList::TYPE_DECLARATION,
+        SetList::STRICT_BOOLEANS,
     ]);
 
     $rectorConfig->parallel();
@@ -37,5 +39,8 @@
             __DIR__ . '/spec',
         ],
         FirstClassCallableRector::class,
+        BooleanInBooleanNotRuleFixerRector::class => [
+            __DIR__ . '/src/Handler/Logging.php',
+        ],
     ]);
 };
diff --git a/src/Handler/Logging.php b/src/Handler/Logging.php
index 96cfe049..b22d57f5 100644
--- a/src/Handler/Logging.php
+++ b/src/Handler/Logging.php
@@ -237,11 +237,11 @@ private function isExists(
 
     private function sendMail(int $priority, string $errorMessage, array $extra, string $subject): void
     {
-        if (! $this->message || ! $this->mailMessageTransport) {
+        if (! $this->message instanceof Message || ! $this->mailMessageTransport instanceof TransportInterface) {
             return;
         }
 
-        if (! $this->emailReceivers) {
+        if ($this->emailReceivers === []) {
             return;
         }