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diff --git a/vendor/psy/psysh/src/Psy/CodeCleaner/InstanceOfPass.php b/vendor/psy/psysh/src/Psy/CodeCleaner/InstanceOfPass.php
new file mode 100644
index 000000000..7c2ae7bb3
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/CodeCleaner/InstanceOfPass.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Expr\Instanceof_ as InstanceofStmt;
+use PhpParser\Node\Scalar;
+use PhpParser\Node\Scalar\Encapsed;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that the instanceof statement does not receive a scalar value or a non-class constant.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class InstanceOfPass extends CodeCleanerPass
+{
+    /**
+     * Validate that the instanceof statement does not receive a scalar value or a non-class constant.
+     *
+     * @throws FatalErrorException if a scalar or a non-class constant is given
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        if (!$node instanceof InstanceofStmt) {
+            return;
+        }
+
+        if (($node->expr instanceof Scalar && !$node->expr instanceof Encapsed) || $node->expr instanceof ConstFetch) {
+            throw new FatalErrorException('instanceof expects an object instance, constant given');
+        }
+    }
+}