Initialisation de la collection HasValidation si null

config/module.config.php

@@ -54,6 +54,7 @@ return [
                                 'route'    => 'validation/type',
                                 'resource' => PrivilegeController::getResourceId(ValidationTypeController::class, 'index'),
                                 'order'    => 1111,
+                                'icon' => 'fas fa-angle-right',
                                 'pages' => [
                                     'instance' => [
                                         'label'    => 'Instances de validation',

src/UnicaenValidation/Entity/HasValidationsTrait.php

@@ -8,7 +8,7 @@ use UnicaenValidation\Entity\Db\ValidationInstance;
 
 trait HasValidationsTrait {
 
-    private Collection $validations;
+    private ?Collection $validations = null ;
 
     /**
      * @return ValidationInstance[]
@@ -24,6 +24,7 @@ trait HasValidationsTrait {
      */
     public function addValidation(ValidationInstance $validation) : void
     {
+        if ($this->validations === null) $this->validations = new ArrayCollection();
         $this->validations->add($validation);
     }