diff --git a/app.py b/app.py
index a5b4243..22aeedd 100644
--- a/app.py
+++ b/app.py
@@ -219,12 +219,14 @@ def habit_create():
         errors=errors,
     )"""
 
+
 @app.route('/check', methods=['POST'])
 @login_required
 def check_habit():
     habit = request.get_json()["habitId"]
     return {}
 
+
 # Run the application
 if __name__ == '__main__':
     app.run(port=5000, debug=True)
diff --git a/db/SQLiteClient.py b/db/SQLiteClient.py
index bd54171..ae9bb5f 100644
--- a/db/SQLiteClient.py
+++ b/db/SQLiteClient.py
@@ -75,13 +75,17 @@ def create_habit(user_id: int, name: str, times: int, unit: int, slot: int, note
     return cursor.lastrowid
 
 
-def get_next_slot():
-    query = f"SELECT slot FROM habits ORDER BY slot DESC LIMIT 1;"
+def get_next_slot(user_id: int):
+    query = f"SELECT slot FROM habits WHERE user_id = {user_id} ORDER BY slot DESC LIMIT 1;"
     conn = con3()
     cursor = conn.cursor()
     cursor.execute(query)
     slot = cursor.fetchone()
     conn.close()
+
+    if not slot:
+        return 0
+
     return slot[0] + 1 if slot else 0
 
 
diff --git a/models/Habit.py b/models/Habit.py
index 044b83b..812330f 100644
--- a/models/Habit.py
+++ b/models/Habit.py
@@ -20,7 +20,7 @@ class Habit:
 
     @staticmethod
     def create(user_id: int, name: str, times: int, note: str | None = None, unit: int | None = 1):
-        slot = get_next_slot()
+        slot = get_next_slot(user_id)
         id = create_habit(user_id, name, times, unit, slot, note)
         return Habit(id, user_id, name, note, times, unit, slot)