diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e8cf1928..822d530d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ You can find and compare releases at the [GitHub release page](https://github.co
 
 ## Unreleased
 
+## v6.42.1
+
+### Changed
+
+- Improve validation message when using output types as inputs https://github.com/nuwave/lighthouse/pull/2594
+
 ## v6.42.0
 
 ### Added
diff --git a/src/Schema/Factories/ArgumentFactory.php b/src/Schema/Factories/ArgumentFactory.php
index 39ab3dceb..b27ea469c 100644
--- a/src/Schema/Factories/ArgumentFactory.php
+++ b/src/Schema/Factories/ArgumentFactory.php
@@ -3,7 +3,6 @@
 namespace Nuwave\Lighthouse\Schema\Factories;
 
 use GraphQL\Language\AST\InputValueDefinitionNode;
-use GraphQL\Type\Definition\InputType;
 use GraphQL\Type\Definition\Type;
 use Illuminate\Container\Container;
 use Nuwave\Lighthouse\Schema\AST\ASTHelper;
@@ -46,7 +45,6 @@ public function convert(InputValueDefinitionNode $definitionNode): array
     {
         $definitionNodeConverter = Container::getInstance()->make(ExecutableTypeNodeConverter::class);
         $type = $definitionNodeConverter->convert($definitionNode->type);
-        assert($type instanceof Type && $type instanceof InputType);
 
         $config = [
             'name' => $definitionNode->name->value,
diff --git a/tests/Integration/Schema/ValidatorTest.php b/tests/Integration/Schema/ValidatorTest.php
new file mode 100644
index 000000000..c75969b25
--- /dev/null
+++ b/tests/Integration/Schema/ValidatorTest.php
@@ -0,0 +1,28 @@
+<?php declare(strict_types=1);
+
+namespace Tests\Integration\Schema;
+
+use GraphQL\Error\InvariantViolation;
+use Nuwave\Lighthouse\Schema\Validator as SchemaValidator;
+use Tests\TestCase;
+
+final class ValidatorTest extends TestCase
+{
+    public function testOutputTypeUsedAsInput(): void
+    {
+        $this->schema = /** @lang GraphQL */ '
+        type Query {
+            foo(foo: Foo): Int
+        }
+
+        type Foo {
+            foo: Int
+        }
+        ';
+
+        $schemaValidator = $this->app->make(SchemaValidator::class);
+
+        $this->expectExceptionObject(new InvariantViolation('The type of Query.foo(foo:) must be Input Type but got: Foo.'));
+        $schemaValidator->validate();
+    }
+}
diff --git a/tests/Unit/Http/Middleware/LogGraphQLQueriesTest.php b/tests/Unit/Http/Middleware/LogGraphQLQueriesTest.php
index 9c6bea956..e25ce3a8d 100644
--- a/tests/Unit/Http/Middleware/LogGraphQLQueriesTest.php
+++ b/tests/Unit/Http/Middleware/LogGraphQLQueriesTest.php
@@ -4,13 +4,14 @@
 
 use Illuminate\Contracts\Config\Repository as ConfigRepository;
 use Nuwave\Lighthouse\Http\Middleware\LogGraphQLQueries;
+use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
 use Tests\TestCase;
 
 final class LogGraphQLQueriesTest extends TestCase
 {
     /** @var \PHPUnit\Framework\MockObject\MockObject&\Psr\Log\LoggerInterface */
-    protected $logger;
+    protected MockObject $logger;
 
     protected function getEnvironmentSetUp($app): void
     {
@@ -28,10 +29,10 @@ protected function getEnvironmentSetUp($app): void
     public function testLogsEveryQuery(): void
     {
         $query = /** @lang GraphQL */ <<<'GRAPHQL'
-{
-    foo
-}
-GRAPHQL;
+        {
+            foo
+        }
+        GRAPHQL;
 
         $this->logger
             ->expects($this->once())