diff --git a/app/Auth/CrmUserProvider.php b/app/Auth/CrmUserProvider.php
index 43dabcc..8c5b737 100644
--- a/app/Auth/CrmUserProvider.php
+++ b/app/Auth/CrmUserProvider.php
@@ -143,7 +143,13 @@ class CrmUserProvider extends EloquentUserProvider implements UserProviderContra
         ]);
         $model->hashcode          = $crmCustomer->hashcode;
         $model->email_verified_at = $crmCustomer->status ? now() : null;
-        $model->saveOrFail();
+        // Check if model is in local databse.
+        $exists = $model::query()->where('email', $model->email)->exists();
+        if (!$exists) {
+            $model->saveOrFail();
+        } else {
+            throw new \Exception('Le modèle existe déjà dans la base locale.');
+        }
 
         return $model;
     }
diff --git a/app/Http/Controllers/Fo/Auth/RegisterController.php b/app/Http/Controllers/Fo/Auth/RegisterController.php
index 148ef06..61c04fc 100644
--- a/app/Http/Controllers/Fo/Auth/RegisterController.php
+++ b/app/Http/Controllers/Fo/Auth/RegisterController.php
@@ -18,6 +18,7 @@ use LDC\LDCCRM\Enums\ApiError;
 use LDC\LDCCRM\Exceptions\ApiErrorException;
 use LDC\LDCCRM\Exceptions\ValidationException as CrmValidationException;
 use LDC\LDCCRM\Models\Customer as CrmCustomer;
+use Illuminate\Database\QueryException;
 
 class RegisterController extends Controller
 {
@@ -81,6 +82,7 @@ class RegisterController extends Controller
      * @return \App\Models\Customer
      * @throws IlluminateValidationException If there are validation errors.
      * @throws \RuntimeException On unhandled api Error.
+     * @throws IlluminateValidationException If there are already an email.
      */
     protected function create(array $data): Customer
     {
@@ -138,7 +140,16 @@ class RegisterController extends Controller
             throw IlluminateValidationException::withMessages([
                 'error' => $e->getMessage()
             ]);
-        } //end try
+        } catch (QueryException $e) {
+            if ($e->getCode() === '23000') {
+                throw IlluminateValidationException::withMessages([
+                    'error' => trans('Un compte existe déjà avec cette adresse.')
+                ]);
+            }
+            report($e);
+            Log::error(__CLASS__ . '::create reached end of possibilities.');
+            throw new \RuntimeException(__CLASS__ . '::create reached end of possibilities.');
+        }//end try
     }
 
     /**
diff --git a/app/Http/Requests/Fo/Customers/CreateAccountRequest.php b/app/Http/Requests/Fo/Customers/CreateAccountRequest.php
index beb4ab9..dc00553 100644
--- a/app/Http/Requests/Fo/Customers/CreateAccountRequest.php
+++ b/app/Http/Requests/Fo/Customers/CreateAccountRequest.php
@@ -10,6 +10,7 @@ use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Auth;
 use Illuminate\Validation\Rule;
 use Illuminate\Validation\Rules\Password;
+use Illuminate\Validation\Validator;
 use Kwaadpepper\Enum\Rules\EnumIsValidRule;
 use LDC\LDCCRM\Enums\Country;
 use LDC\LDCCRM\Models\Customer as CrmCustomer;
@@ -99,13 +100,6 @@ class CreateAccountRequest extends FormRequest
                 'required',
                 'email:rfc,dns,spoof',
                 'max:255',
-                // * Does email already exists in CRM ?
-                // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundBeforeLastUsed
-                function (string $attribute, $value, \Closure $fail) {
-                    if (CrmCustomer::findWithEmail(\strval($value))) {
-                        $fail('Un compte existe déjà avec cette adresse.');
-                    }
-                },
                 'unique:customers,email',
             ],
             'password'    => [
@@ -119,6 +113,26 @@ class CreateAccountRequest extends FormRequest
         ];
     }
 
+    /**
+     * Get the "after" validation callables for the request.
+     *
+     * @return array
+     */
+    public function after(): array
+    {
+        return [
+            function (Validator $validator) {
+                if (CrmCustomer::findWithEmail((string) $this->input('email'))) {
+                    $validator->errors()->add(
+                        'email',
+                        'Un compte existe déjà avec cette adresse dans la CRM.'
+                    );
+                }
+            },
+        ];
+    }
+
+
     /**
      * Get custom attributes for validator errors.
      *
diff --git a/app/Models/Customer.php b/app/Models/Customer.php
index 6f1d817..b9bfa70 100644
--- a/app/Models/Customer.php
+++ b/app/Models/Customer.php
@@ -264,7 +264,7 @@ class Customer extends Authenticatable implements MustVerifyEmail
         }
         $this->forceDelete();
         throw ValidationException::withMessages([
-            'error' => trans('Le compte \'existe pas.')
+            'error' => trans('Le compte n\'existe pas.')
         ]);
     }