diff --git a/src/Bundle/ChillMainBundle/Controller/WorkflowController.php b/src/Bundle/ChillMainBundle/Controller/WorkflowController.php
index 33f1bd774..247cdf552 100644
--- a/src/Bundle/ChillMainBundle/Controller/WorkflowController.php
+++ b/src/Bundle/ChillMainBundle/Controller/WorkflowController.php
@@ -19,6 +19,7 @@ use Chill\MainBundle\Pagination\PaginatorFactory;
 use Chill\MainBundle\Repository\Workflow\EntityWorkflowRepository;
 use Chill\MainBundle\Security\Authorization\EntityWorkflowVoter;
 use Chill\MainBundle\Workflow\EntityWorkflowManager;
+use Chill\MainBundle\Workflow\Validator\StepDestValid;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\Request;
@@ -201,9 +202,18 @@ class WorkflowController extends AbstractController
                     $entityWorkflow->getCurrentStep()->addDestUser($user);
                 }
 
-                $this->entityManager->flush();
+                $errors = $this->validator->validate(
+                    $entityWorkflow->getCurrentStep(),
+                    new StepDestValid()
+                );
 
-                return $this->redirectToRoute('chill_main_workflow_show', ['id' => $entityWorkflow->getId()]);
+                if (count($errors) === 0) {
+                    $this->entityManager->flush();
+
+                    return $this->redirectToRoute('chill_main_workflow_show', ['id' => $entityWorkflow->getId()]);
+                }
+
+                return new Response((string) $errors, Response::HTTP_UNPROCESSABLE_ENTITY);
             }
 
             if ($transitionForm->isSubmitted() && !$transitionForm->isValid()) {
@@ -235,6 +245,7 @@ class WorkflowController extends AbstractController
                 'handler_template_data' => $handler->getTemplateData($entityWorkflow),
                 'transition_form' => isset($transitionForm) ? $transitionForm->createView() : null,
                 'entity_workflow' => $entityWorkflow,
+                'transition_form_errors' => $errors ?? [],
                 //'comment_form' => $commentForm->createView(),
             ]
         );
diff --git a/src/Bundle/ChillMainBundle/Resources/public/page/workflow-show/index.js b/src/Bundle/ChillMainBundle/Resources/public/page/workflow-show/index.js
index f589ee7d5..bd05a8aaa 100644
--- a/src/Bundle/ChillMainBundle/Resources/public/page/workflow-show/index.js
+++ b/src/Bundle/ChillMainBundle/Resources/public/page/workflow-show/index.js
@@ -38,8 +38,6 @@ window.addEventListener('DOMContentLoaded', function() {
         transitions.querySelectorAll('.form-check').forEach(function(row) {
 
             const isForward = row.querySelector('input').dataset.isForward;
-            console.log(row);
-            console.log(isForward);
 
             new ShowHide({
                 load_event: null,
@@ -69,7 +67,24 @@ window.addEventListener('DOMContentLoaded', function() {
         });
     }
 
+    // validate form
+    let form = document.querySelector('form[name="workflow_step"]');
 
+    if (form === null) {
+        console.error('form to validate not found');
+    }
 
+    form.addEventListener('submit', function (event) {
+        const datas = new FormData(event.target);
+
+        if (datas.has('workflow_step[future_dest_users]')) {
+            const dests = JSON.parse(datas.get('workflow_step[future_dest_users]'));
+            if (dests === null || (dests instanceof Array && dests.length === 0)) {
+                event.preventDefault();
+                console.log('no users!');
+                window.alert('Indiquez un utilisateur pour traiter la prochaine étape.');
+            }
+        }
+    });
 
 });
diff --git a/src/Bundle/ChillMainBundle/Resources/views/Workflow/_decision.html.twig b/src/Bundle/ChillMainBundle/Resources/views/Workflow/_decision.html.twig
index e557d9e89..64482c067 100644
--- a/src/Bundle/ChillMainBundle/Resources/views/Workflow/_decision.html.twig
+++ b/src/Bundle/ChillMainBundle/Resources/views/Workflow/_decision.html.twig
@@ -46,8 +46,6 @@
         </div>
     </div>
 
-
-
     <div id="transitionFilter">
         {% if transition_form.transitionFilter is defined %}
             {{ form_row(transition_form.transitionFilter) }}
diff --git a/src/Bundle/ChillMainBundle/Workflow/Validator/StepDestValid.php b/src/Bundle/ChillMainBundle/Workflow/Validator/StepDestValid.php
new file mode 100644
index 000000000..7c2d954b2
--- /dev/null
+++ b/src/Bundle/ChillMainBundle/Workflow/Validator/StepDestValid.php
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\MainBundle\Workflow\Validator;
+
+use Symfony\Component\Validator\Constraint;
+
+class StepDestValid extends Constraint
+{
+    public string $messageDestNotAllowed = 'workflow.As the step is final, no dest are allowed';
+
+    public string $messageRequireDest = 'workflow.As the step is not final, dest are required';
+
+    public function getTargets()
+    {
+        return [self::CLASS_CONSTRAINT];
+    }
+}
diff --git a/src/Bundle/ChillMainBundle/Workflow/Validator/StepDestValidValidator.php b/src/Bundle/ChillMainBundle/Workflow/Validator/StepDestValidValidator.php
new file mode 100644
index 000000000..6b8378033
--- /dev/null
+++ b/src/Bundle/ChillMainBundle/Workflow/Validator/StepDestValidValidator.php
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\MainBundle\Workflow\Validator;
+
+use Chill\MainBundle\Entity\Workflow\EntityWorkflowStep;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+use function count;
+
+class StepDestValidValidator extends ConstraintValidator
+{
+    /**
+     * @param EntityWorkflowStep $value
+     * @param Constraint|StepDestValid $constraint
+     *
+     * @return void
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof StepDestValid) {
+            throw new UnexpectedTypeException($constraint, StepDestValid::class);
+        }
+
+        if (!$value instanceof EntityWorkflowStep) {
+            throw new UnexpectedValueException($value, EntityWorkflowStep::class);
+        }
+
+        if ($value->isFinal() && 0 < count($value->getDestUser())) {
+            $this->context->buildViolation($constraint->messageDestNotAllowed)
+                ->addViolation();
+        }
+
+        if (!$value->isFinal() && 0 === count($value->getDestUser())) {
+            $this->context->buildViolation($constraint->messageRequireDest)
+                ->addViolation();
+        }
+    }
+}