diff --git a/composer.json b/composer.json
index b533ae7..732957e 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "nette/di": "^3.1.0",
     "latte/latte": "^3.0.0",
     "contributte/qa": "^0.3",
-    "contributte/phpstan": "^0.1",
+    "contributte/phpstan": "^0.2",
     "webchemistry/testing-helpers": "^4.0.0"
   },
   "conflict": {
diff --git a/phpstan.neon b/phpstan.neon
index 2cc7d7c..5eda96f 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -16,3 +16,11 @@ parameters:
 	paths:
 		- src
 		- .docs
+
+	ignoreErrors:
+		# https://github.com/phpstan/phpstan-nette/issues/141
+		-
+			message: '#^Parameter \#1 \$array of function array_filter expects array, Iterator\<int\|string, Nette\\ComponentModel\\IComponent\> given\.$#'
+			identifier: argument.type
+			count: 3
+			path: src/Multiplier.php
diff --git a/src/Multiplier.php b/src/Multiplier.php
index 8cf4c12..2fe7c42 100644
--- a/src/Multiplier.php
+++ b/src/Multiplier.php
@@ -110,6 +110,9 @@ public static function register(string $name = 'addMultiplier'): void
 		});
 	}
 
+	/**
+	 * @return ($throw is true ? Form : ?Form)
+	 */
 	public function getForm(bool $throw = true): ?Form
 	{
 		if ($this->form) {
@@ -378,7 +381,7 @@ protected function isValidMaxCopies(): bool
 
 	protected function isFormSubmitted(): bool
 	{
-		return $this->getForm() !== null && $this->getForm()->isAnchored() && $this->getForm()->isSubmitted();
+		return $this->getForm(false) !== null && $this->getForm()->isAnchored() && $this->getForm()->isSubmitted();
 	}
 
 	protected function loadHttpData(): void