diff --git a/src/Support/OperationParams.php b/src/Support/OperationParams.php
index 1c8686c6..defe59c4 100644
--- a/src/Support/OperationParams.php
+++ b/src/Support/OperationParams.php
@@ -13,9 +13,6 @@ class OperationParams extends BaseOperationParams
     /** @var DocumentNode|null */
     protected $parsedQuery;
 
-    /** @var BaseOperationParams */
-    protected $baseOperationParams;
-
     public function __construct(BaseOperationParams $baseOperationParams)
     {
         $this->init($baseOperationParams);
@@ -28,8 +25,8 @@ protected function init(BaseOperationParams $baseOperationParams): void
         $this->operation = $baseOperationParams->operation;
         $this->variables = $baseOperationParams->variables;
         $this->extensions = $baseOperationParams->extensions;
-
-        $this->baseOperationParams = $baseOperationParams;
+        $this->originalInput = $baseOperationParams->originalInput ?? [];
+        $this->readOnly = $baseOperationParams->readOnly ?? false;
     }
 
     /**
@@ -37,12 +34,12 @@ protected function init(BaseOperationParams $baseOperationParams): void
      */
     public function getOriginalInput(string $key)
     {
-        return $this->baseOperationParams->originalInput[$key] ?? null;
+        return $this->originalInput[$key] ?? null;
     }
 
     public function isReadOnly(): bool
     {
-        return $this->baseOperationParams->readOnly;
+        return $this->readOnly;
     }
 
     public function getParsedQuery(): DocumentNode
diff --git a/tests/Unit/ExecutionMiddlewareTest/ExecutionMiddlewareTest.php b/tests/Unit/ExecutionMiddlewareTest/ExecutionMiddlewareTest.php
index 5e90b9b2..28455ed6 100644
--- a/tests/Unit/ExecutionMiddlewareTest/ExecutionMiddlewareTest.php
+++ b/tests/Unit/ExecutionMiddlewareTest/ExecutionMiddlewareTest.php
@@ -5,6 +5,7 @@
 
 use Illuminate\Auth\GenericUser;
 use Rebing\GraphQL\Support\ExecutionMiddleware\AddAuthUserContextValueMiddleware;
+use Rebing\GraphQL\Support\ExecutionMiddleware\ValidateOperationParamsMiddleware;
 use Rebing\GraphQL\Tests\TestCase;
 
 class ExecutionMiddlewareTest extends TestCase
@@ -171,4 +172,30 @@ public function testAddAuthUserContextValueMiddleware(): void
         ];
         self::assertSame($expected, $result);
     }
+
+    public function testValidateOperationParamsMiddlewareWithInvalidParams(): void
+    {
+        $this->app['config']->set('graphql.execution_middleware', [
+            ValidateOperationParamsMiddleware::class,
+        ]);
+
+        $result = $this->httpGraphql($this->queries['examples'], [
+            'expectErrors' => true,
+            'variables' => [
+                [],
+            ],
+        ]);
+
+        $expected = [
+            'errors' => [
+                [
+                    'message' => 'GraphQL Request parameter "variables" must be object or JSON string parsed to object, but got [[]]',
+                    'extensions' => [
+                    ],
+                ],
+            ],
+        ];
+
+        self::assertEquals($expected, $result);
+    }
 }