diff --git a/.gitignore b/.gitignore
index e5cac5c..f48a397 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,4 +23,5 @@
 
 ###> phpstan/phpstan ###
 phpstan.*
+!phpstan.dist.neon
 ###< phpstan/phpstan ###
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
new file mode 100644
index 0000000..4278926
--- /dev/null
+++ b/phpstan.dist.neon
@@ -0,0 +1,10 @@
+parameters:
+    level: 6
+    paths:
+        - bin/
+        - config/
+        - public/
+        - src/
+        - tests/
+includes:
+    - phpstan-baseline.neon
diff --git a/src/Factory/RatingFactory.php b/src/Factory/RatingFactory.php
index 390fb4d..499c687 100644
--- a/src/Factory/RatingFactory.php
+++ b/src/Factory/RatingFactory.php
@@ -33,7 +33,7 @@ final class RatingFactory extends PersistentObjectFactory
     {
         return [
             'score' => self::faker()->numberBetween(1, 5),
-            'note' => self::faker()->optional()->sentence(),
+            'note' => self::faker()->optional()->sentence() ?? '',
             'subject' => RestaurantFactory::new(),
             'user' => UserFactory::new(),
         ];