diff --git a/app.py b/app.py
index 0b76747..aa31d8f 100644
--- a/app.py
+++ b/app.py
@@ -168,11 +168,12 @@ def get_image():
 @app.route("/api/release_allocation", methods=['POST'])
 def release_allocation():
     try:
-        id_allocation = db.get_conf_id_name(request.headers['name']+".squashfs")
+        id_allocation = db.get_conf_id_name(
+            request.headers['name']+".squashfs")
         if id_allocation is None or id_allocation == "":
             return jsonify(message="400")
     except:
-        pass
+        return jsonify(message="400")
     if id_allocation is not None:
         db.del_image_allocation_id_image(id_allocation)
     else:
diff --git a/utils.py b/utils.py
index 7a6d2af..709bb71 100644
--- a/utils.py
+++ b/utils.py
@@ -10,17 +10,21 @@ from time import sleep
 import db
 import config
 
+
 def generate_random_string(length):
     letters = string.ascii_letters
     random_string = ''.join(random.choice(letters) for i in range(length))
     return random_string
 
+
 def hash_password(password):
     return hashlib.sha512(password.encode('utf-8')).hexdigest()
 
+
 def generate_auth_token():
     return secrets.token_urlsafe(32)
 
+
 def ping_client(ip):
     response = os.system("ping -c 1 " + ip + "> /dev/null")
 
@@ -28,12 +32,12 @@ def ping_client(ip):
         return True
     else:
         return False
-    
 
 
 def ssh_thread_function():
-    subprocess.run(['wssh','--fbidhttp=False', '--port='+config.webssh_port])
-        
+    subprocess.run(['wssh', '--fbidhttp=False', '--port='+config.webssh_port])
+
+
 def check_allocation_thread_function():
     while True:
         ids = db.get_image_allocation_all()
@@ -41,14 +45,16 @@ def check_allocation_thread_function():
             ip = db.get_image_allocation_clientip_id(x[0])
             ping_thread = PingThread(ip, x[0])
             ping_thread.start()
-            
+
         sleep(10)
-        
+
+
 class PingThread(threading.Thread):
     def __init__(self, ip, id):
         super(PingThread, self).__init__()
         self.Ip = ip
         self.Id = id
+
     def run(self):
         if self.Ip is None:
             return
@@ -57,14 +63,16 @@ class PingThread(threading.Thread):
             if date is None:
                 return
             delta = datetime.datetime.now() - date
-            if delta.total_seconds()  > 30:
+            if delta.total_seconds() > 30:
                 db.del_image_allocation_id(self.Id)
         else:
             db.update_image_allocation_time(self.Id)
-            
-def init_threads():    
+
+
+def init_threads():
     ssh_thread = threading.Thread(target=ssh_thread_function)
     ssh_thread.start()
 
-    allocation_thread = threading.Thread(target=check_allocation_thread_function)
-    allocation_thread.start()
\ No newline at end of file
+    allocation_thread = threading.Thread(
+        target=check_allocation_thread_function)
+    allocation_thread.start()