Correctif

producer/controllers/OrderController.php

         $producerManager = $this->getProducerManager();
 
         $user = GlobalParam::getCurrentUser();
-        $userProducer = $userProducerManager->findOneUserProducer($user, $producer);
-
-        if ($user && !$userProducer) {
-            $userProducer = $producerManager->addUser($user, $producer);
+        if($user) {
+            $userProducer = $userProducerManager->findOneUserProducer($user, $producer);
+            if (!$userProducer) {
+                $userProducer = $producerManager->addUser($user, $producer);
+            }
         }
 
         $jsonUser = false;