diff --git a/src/Controller/AdminController.php b/src/Controller/AdminController.php
index 4b9691b..1b519a9 100644
--- a/src/Controller/AdminController.php
+++ b/src/Controller/AdminController.php
@@ -205,6 +205,7 @@ class AdminController extends AbstractController
 
         /** @var User $user */
         $user = $userRepo->find($id);
+        $prevSup = $this->entityManager->getRepository(Supervision::class)->findBy(['user' => $user]);
 
         $form = $this->createForm(SupervisorFormType::class);
         $form->handleRequest($request);
@@ -212,6 +213,11 @@ class AdminController extends AbstractController
         if ($form->isSubmitted() && $form->isValid()) {
             $supervisor = $form->get('supervisor')->getData();
 
+            if (count($prevSup) > 0) {
+                $this->entityManager->remove($prevSup[0]);
+                $this->entityManager->flush();
+            }
+
             $sup = new Supervision();
             $sup->setSupervisor($supervisor);
             $sup->setWorker($user);