diff --git a/server_files/config.php b/server_files/config.php
index 98b892a..459906c 100644
--- a/server_files/config.php
+++ b/server_files/config.php
@@ -45,10 +45,11 @@ class Config
 		global $DB;
 
 		$DB->exec("SET GLOBAL time_zone = 'Europe/Paris';");
-		$DB->exec("INSERT IGNORE INTO `config` VALUES ('inscription_date', CURRENT_TIMESTAMP), ('start_phase1_date', CURRENT_TIMESTAMP), ('end_phase1_date', CURRENT_TIMESTAMP),
-                                   ('start_phase2_date', CURRENT_TIMESTAMP), ('end_phase2_date', CURRENT_TIMESTAMP),
-                                   ('start_phase3_date', CURRENT_TIMESTAMP), ('end_phase3_date', CURRENT_TIMESTAMP),
-                                   ('start_phase4_date', CURRENT_TIMESTAMP), ('end_phase4_date', CURRENT_TIMESTAMP);");
+		$DB->exec("INSERT IGNORE INTO `config` VALUES ('inscription_date', CURRENT_TIMESTAMP + INTERVAL 2 DAY),
+                                   ('start_phase1_date', CURRENT_TIMESTAMP + INTERVAL 1 DAY), ('end_phase1_date', CURRENT_TIMESTAMP + INTERVAL 3 DAY),
+                                   ('start_phase2_date', CURRENT_TIMESTAMP + INTERVAL 4 DAY), ('end_phase2_date', CURRENT_TIMESTAMP + INTERVAL 5 DAY),
+                                   ('start_phase3_date', CURRENT_TIMESTAMP + INTERVAL 6 DAY), ('end_phase3_date', CURRENT_TIMESTAMP + INTERVAL 7 DAY),
+                                   ('start_phase4_date', CURRENT_TIMESTAMP + INTERVAL 8 DAY), ('end_phase4_date', CURRENT_TIMESTAMP + INTERVAL 9 DAY);");
 	}
 
 	public function loadConfigValues()
diff --git a/server_files/controllers/inscription.php b/server_files/controllers/inscription.php
index 6006b39..8b4d9af 100644
--- a/server_files/controllers/inscription.php
+++ b/server_files/controllers/inscription.php
@@ -48,6 +48,7 @@ class NewUser
 		ensure($this->surname != "", "Le nom de famille est obligatoire.");
 		ensure($this->first_name != "", "Le prénom est obligatoire.");
 		$this->role = Role::fromName(strtoupper($this->role));
+		ensure($this->role == Role::PARTICIPANT || $this->role == Role::ENCADRANT, "Vous devez être participant ou encadrant.");
 
 		if ($this->role == Role::PARTICIPANT)
 			$this->class = SchoolClass::fromName(strtoupper($this->class));
@@ -59,6 +60,9 @@ class NewUser
 	{
 		global $DB, $YEAR;
 
+		if (!$DB->query("SELECT `id` FROM `users` WHERE `year` = $YEAR;")->fetch())
+			$this->role = Role::ADMIN;
+
 		$req = $DB->prepare("INSERT INTO `users`(`email`, `pwd_hash`, `confirm_email`, `surname`, `first_name`, `school`, `class`, `role`, `description`, `year`)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);");
 		$req->execute([$this->email, password_hash($this->password, PASSWORD_BCRYPT), $this->confirm_email_token, $this->surname, $this->first_name,
diff --git a/server_files/model.php b/server_files/model.php
index 0a21cee..b3889c7 100644
--- a/server_files/model.php
+++ b/server_files/model.php
@@ -9,6 +9,11 @@ function loadUserValues()
 
 	if (isset($_SESSION["user_id"])) {
 		$user = $_SESSION["user"] = User::fromId($_SESSION["user_id"]);
+		if ($user == null) {
+			unset($_SESSION["user_id"]);
+			return;
+		}
+
 		$_SESSION["role"] = $user->getRole();
 
 		if ($user->getTeamId() !== null)