diff --git a/openslides/users/models.py b/openslides/users/models.py
index 415ed2c29..7cc49008c 100644
--- a/openslides/users/models.py
+++ b/openslides/users/models.py
@@ -14,6 +14,7 @@ from django.db.models import Prefetch, Q
 
 from openslides.utils.search import user_name_helper
 
+from ..utils.collection import CollectionElement
 from ..utils.models import RESTModelMixin
 from .access_permissions import GroupAccessPermissions, UserAccessPermissions
 
@@ -196,6 +197,16 @@ class User(RESTModelMixin, PermissionsMixin, AbstractBaseUser):
         # Return result
         return name
 
+    def save(self, *args, **kwargs):
+        """
+        Overridden method to skip autoupdate if only last_login field was
+        updated as it is done during login.
+        """
+        if kwargs.get('update_fields') == ['last_login']:
+            kwargs['skip_autoupdate'] = True
+            CollectionElement.from_instance(self)
+        return super().save(*args, **kwargs)
+
     def get_search_index_string(self):
         """
         Returns a string that can be indexed for the search.
diff --git a/openslides/utils/search.py b/openslides/utils/search.py
index 0da9b4f63..4193ac87f 100644
--- a/openslides/utils/search.py
+++ b/openslides/utils/search.py
@@ -73,7 +73,12 @@ class Index:
             pass
         path = self.get_index_path()
         if path != 'ram' and exists_in(path):
-            return open_dir(path)
+            # Quick fix to bypass errors when many clients login.
+            # TODO: Solve this hack.
+            try:
+                return open_dir(path)
+            except FileNotFoundError:
+                pass
         return self.create_index()