diff --git a/gruppenbildungsspiel.py b/gruppenbildungsspiel.py
index 8e889aa..3fe6cad 100644
--- a/gruppenbildungsspiel.py
+++ b/gruppenbildungsspiel.py
@@ -44,7 +44,6 @@ class SolutionForm(Form):
 
 def create_used_id_list():
     data = list()
-
     if not os.path.exists(datafile):
         open(datafile, "a").close()
 
@@ -54,16 +53,14 @@ def create_used_id_list():
             data.append(line[0])
     return data
 
-def check_id(user_id):
+def check_id(form, field):
     used_ids = create_used_id_list()
-    if user_id in used_ids:
-        return True
-    else: 
-        return False
+    if field.data not in used_ids:
+        raise validators.ValidationError('Leider keine gültige ID')
 
 class AnswerForm(Form):
     used_id_list = create_used_id_list()
-    user_id = StringField('Deine Id', [validators.InputRequired(), validators.AnyOf(values=used_id_list, message='Leider ist das keine gültige ID')])
+    user_id = StringField('Deine Id', [validators.InputRequired(), check_id])
 
 
 
@@ -135,14 +132,10 @@ def admin_solution():
 
 @app.route('/answers', methods=['GET', 'POST'])
 def answers():
-    file_data = create_used_id_list()
-    print(file_data)
     form = AnswerForm(request.form)
-    if request.method == 'POST':
-        print(request.form['user_id'])
-        if request.form['user_id'] in file_data:
-            ident = request.form['user_id'] 
-            return redirect(url_for('view_answers', user_id=ident))
+    if request.method == 'POST' and form.validate():
+        ident = request.form['user_id'] 
+        return redirect(url_for('view_answers', user_id=ident))
     return render_template('answers.html', form=form, title='Sortierhut', text='Hallo, Admin Fooboar') 
 
 @app.route('/view_answers<user_id>')