do not apply the Valid constraint on scalar form data

Author: xabbuh

Extension/Validator/Constraints/FormValidator.php

@@ -110,7 +110,9 @@ public function validate($form, Constraint $formConstraint)
                 foreach ($constraints as $constraint) {
                     // For the "Valid" constraint, validate the data in all groups
                     if ($constraint instanceof Valid) {
-                        $validator->atPath('data')->validate($data, $constraint, $groups);
+                        if (\is_object($data)) {
+                            $validator->atPath('data')->validate($data, $constraint, $groups);
+                        }
 
                         continue;
                     }