diff --git a/apps/auth/views.py b/apps/auth/views.py
index 4e173b1b..77f3a37f 100644
--- a/apps/auth/views.py
+++ b/apps/auth/views.py
@@ -1,3 +1,5 @@
+import os
+
 from uuid import uuid4
 from urllib.parse import urlsplit
 
@@ -182,7 +184,7 @@ class FacebookLoginOrRegistration(View):
                 login(requests, user=user)
                 return JsonResponse({"success": True})
         else:
-            if not user.photo and photo_data:
+            if (not user.photo or (user.photo and not os.path.isfile(user.photo.path))) and photo_data:
                 photo = ContentFile(photo_data)
                 fname = str(fb_id) + '.jpg'
                 user.photo.save(fname, photo, save=True)
diff --git a/apps/payment/views.py b/apps/payment/views.py
index 412b5516..d719beb9 100644
--- a/apps/payment/views.py
+++ b/apps/payment/views.py
@@ -6,7 +6,6 @@ from urllib.parse import urlsplit
 
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required
-from django.core.exceptions import DisallowedHost
 from django.http import HttpResponse
 from django.shortcuts import redirect, get_object_or_404
 from django.views.generic import View, TemplateView
@@ -26,6 +25,10 @@ from .models import AuthorBalance, CoursePayment, SchoolPayment
 logger = logging.getLogger('django')
 
 
+class DisallowedPingbackHost(Exception):
+    pass
+
+
 @method_decorator(login_required, name='dispatch')
 class CourseBuySuccessView(TemplateView):
     template_name = 'payment/course_payment_success.html'
@@ -248,5 +251,5 @@ class PaymentwallCallbackView(View):
                 payment.author_balance.save()
             return HttpResponse('OK')
         else:
-            raise DisallowedHost
+            raise DisallowedPingbackHost
             return HttpResponse(status=403)
diff --git a/apps/school/models.py b/apps/school/models.py
index ad9efb2e..f63a2024 100644
--- a/apps/school/models.py
+++ b/apps/school/models.py
@@ -45,7 +45,7 @@ class SchoolSchedule(models.Model):
 
     def is_online(self):
         end_at = datetime.combine(now().today(), self.start_at) + timedelta(hours=2)
-        return self.start_at <= now().time() and end_at.time() >= now().time()
+        return self.start_at <= now().time() and end_at.time() >= now().time() and self.weekday == now().isoweekday()
 
     def current_live_lesson(self):
         now_time = now()
diff --git a/apps/user/models.py b/apps/user/models.py
index fd94ab81..6adf6cf4 100644
--- a/apps/user/models.py
+++ b/apps/user/models.py
@@ -24,7 +24,6 @@ class UserManager(BaseUserManager):
             username = email
         if not password:
             password = self.make_random_password()
-        super().save(*args, **kwargs)
         email = self.normalize_email(email)
         username = self.model.normalize_username(username)
         user = self.model(username=username, email=email, **extra_fields)