diff --git a/.gitattributes b/.gitattributes
index 3f33ddc..c60a4b0 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -2,6 +2,7 @@
 /.php-cs-fixer.*  export-ignore
 /CHANGELOG.md     export-ignore
 /docs/            export-ignore
+/phpstan*.neon    export-ignore
 /phpunit.xml.dist export-ignore
 /LICENSE          export-ignore
 /README.md        export-ignore
diff --git a/composer.json b/composer.json
index edfee04..20850c8 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,8 @@
     ],
     "require": {
         "php": "^7.3 || ^8.0",
-        "symfony/form": "^4.4 || ^5.0 || ^6.0"
+        "symfony/form": "^4.4 || ^5.0 || ^6.0",
+        "symfony/framework-bundle": "^4.4 || ^5.0 || ^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
@@ -20,7 +21,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.0.x-dev"
+            "dev-master": "1.x-dev"
         }
     },
     "autoload": {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..776ccd8
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,4 @@
+parameters:
+    level: max
+    paths:
+        - src
diff --git a/src/Form/Messenger/AbstractBusType.php b/src/Form/Messenger/AbstractBusType.php
index 920f8b8..9ab9854 100644
--- a/src/Form/Messenger/AbstractBusType.php
+++ b/src/Form/Messenger/AbstractBusType.php
@@ -46,7 +46,7 @@ public function handle(FormEvent $event, object $command): void
             $prev = $exception->getPrevious();
             if ($prev instanceof \DomainException || $prev instanceof \InvalidArgumentException) {
                 $event->getForm()->addError(new FormError($prev->getMessage()));
-            } else {
+            } elseif (null !== $prev) {
                 throw $prev;
             }
         } catch (\DomainException | \InvalidArgumentException $exception) {