ensures that getType() returns ReflectionNamedType

Author: dg

src/Forms/Container.php

@@ -172,7 +172,9 @@ public function validate(array $controls = null): void
 			}
 			foreach ($this->onValidate as $handler) {
 				$params = Nette\Utils\Callback::toReflection($handler)->getParameters();
-				$values = isset($params[1]) ? $this->getValues($params[1]->getType() ? $params[1]->getType()->getName() : null) : null;
+				$values = isset($params[1])
+					? $this->getValues($params[1]->getType() instanceof \ReflectionNamedType ? $params[1]->getType()->getName() : null)
+					: null;
 				$handler($this, $values);
 			}
 		}

src/Forms/Form.php

@@ -427,7 +427,9 @@ private function invokeHandlers(iterable $handlers, $button = null): void
 	{
 		foreach ($handlers as $handler) {
 			$params = Nette\Utils\Callback::toReflection($handler)->getParameters();
-			$values = isset($params[1]) ? $this->getValues($params[1]->getType() ? $params[1]->getType()->getName() : null) : null;
+			$values = isset($params[1])
+				? $this->getValues($params[1]->getType() instanceof \ReflectionNamedType ? $params[1]->getType()->getName() : null)
+				: null;
 			$handler($button ?: $this, $values);
 			if (!$this->isValid()) {
 				return;