diff --git a/public/index.php b/public/index.php
index 71b2d2b..89117fa 100644
--- a/public/index.php
+++ b/public/index.php
@@ -32,6 +32,10 @@
 
 function getRedirection($redirect_uri)
 {
+	if (preg_match("/^\/exercises\/([0-9]+)$/", $redirect_uri, $str)) {
+		deleteExercise($str[1]);
+		return;
+	}
 	switch ($redirect_uri) {
 		case '/':
 			home();
diff --git a/src/controllers/exercise_controller.php b/src/controllers/exercise_controller.php
index 49e9738..96f6434 100644
--- a/src/controllers/exercise_controller.php
+++ b/src/controllers/exercise_controller.php
@@ -12,3 +12,18 @@ function createExercise()
 	$exercise = Exercises::create($_POST['exercise_title']);
 	header('Location: /exercises/' . $exercise->getId() . '/fields');
 }
+
+function deleteExercise($id)
+{
+	try {
+		$exercise = new Exercises($id);
+	} catch (Exception $e) {
+		lost();
+		return;
+	}
+
+	if ($exercise->getExerciseStatus() == Status::Building->value || $exercise->getExerciseStatus() == Status::Closed->value) {
+		$exercise->delete();
+	}
+	header('Location: /exercises');
+}
diff --git a/src/models/databases_connectors/databases_access.php b/src/models/databases_connectors/databases_access.php
index 8e319e4..26dd8dc 100644
--- a/src/models/databases_connectors/databases_access.php
+++ b/src/models/databases_connectors/databases_access.php
@@ -9,4 +9,8 @@ public function createExercise(string $title): int;
 	public function getExerciseTitle(int $id): string;
 
 	public function getExercises(int $status = -1): array;
+
+	public function deleteExercise(int $id): void;
+
+	public function getExerciseStatus(int $id): string;
 }
diff --git a/src/models/databases_connectors/postgresql/postgresql.php b/src/models/databases_connectors/postgresql/postgresql.php
index 52fb02c..24ab270 100644
--- a/src/models/databases_connectors/postgresql/postgresql.php
+++ b/src/models/databases_connectors/postgresql/postgresql.php
@@ -26,13 +26,8 @@ public function modify(string $squery, array $args = [])
 	{
 		if ($args) {
 			$statement = $this->db->prepare($squery);
-			$statement->bindParam(':id', $args[':id']);
 			foreach ($args as $key => $value) {
-				if (is_int($value)) {
-					$statement->bindParam(':' . $key, $value);
-				} else {
-					$statement->bindParam(':' . $key, $value);
-				}
+				$statement->bindParam($key, $value);
 			}
 			$statement->execute();
 		} else {
diff --git a/src/models/databases_connectors/postgresql/postgresql_access.php b/src/models/databases_connectors/postgresql/postgresql_access.php
index 01f13bd..b0759ce 100644
--- a/src/models/databases_connectors/postgresql/postgresql_access.php
+++ b/src/models/databases_connectors/postgresql/postgresql_access.php
@@ -29,6 +29,12 @@ public function getExerciseTitle(int $id): string
 		return $result[0]['title'];
 	}
 
+	public function getExerciseStatus(int $id): string
+	{
+		$result = $this->postgresql->select('SELECT status FROM exercises WHERE id = :id', [':id' => $id]);
+		return $result[0]['status'];
+	}
+
 	public function getExercises(int $status = -1): array
 	{
 		if ($status < 0) {
@@ -37,6 +43,11 @@ public function getExercises(int $status = -1): array
 		return $this->postgresql->select('SELECT id FROM exercises WHERE status = :status', [':status' => $status]);
 	}
 
+	public function deleteExercise(int $id): void
+	{
+		$this->postgresql->modify('DELETE FROM exercises WHERE id = :id', [':id' => $id]);
+	}
+
 	private function create_db_if_not_exist()
 	{
 		if (count($this->postgresql->select("SELECT 1 FROM information_schema.tables WHERE table_name = 'exercises'")) < 1) {
diff --git a/src/models/exercise.php b/src/models/exercise.php
index dd34a87..9b35c96 100644
--- a/src/models/exercise.php
+++ b/src/models/exercise.php
@@ -40,6 +40,16 @@ public function getTitle()
 		return $this->database_access->getexerciseTitle($this->id);
 	}
 
+	public function getExerciseStatus()
+	{
+		return $this->database_access->getExerciseStatus($this->id);
+	}
+
+	public function delete()
+	{
+		$this->database_access->deleteExercise($this->id);
+	}
+
 	public static function getExercises(Status $status = null)
 	{
 		$database_access = (new DatabasesChoose())->getDatabase();