diff --git a/judge/models/profile.py b/judge/models/profile.py
index 7c5b59c..61c5d5f 100644
--- a/judge/models/profile.py
+++ b/judge/models/profile.py
@@ -255,17 +255,18 @@ class Profile(models.Model):
 
     @cache_wrapper(prefix="Pgbi2")
     def _get_basic_info(self):
-        profile_image_url = None
-        if self.profile_image:
-            profile_image_url = self.profile_image.url
-        return {
-            "first_name": self.user.first_name,
-            "last_name": self.user.last_name,
+        res = {
             "email": self.user.email,
             "username": self.user.username,
             "mute": self.mute,
-            "profile_image_url": profile_image_url,
         }
+        if self.user.first_name:
+            res["first_name"] = self.user.first_name
+        if self.user.last_name:
+            res["last_name"] = self.user.last_name
+        if self.profile_image:
+            res["profile_image_url"] = self.profile_image.url
+        return res
 
     @cached_property
     def _cached_info(self):
@@ -283,11 +284,11 @@ class Profile(models.Model):
 
     @cached_property
     def first_name(self):
-        return self._cached_info["first_name"]
+        return self._cached_info.get("first_name", "")
 
     @cached_property
     def last_name(self):
-        return self._cached_info["last_name"]
+        return self._cached_info.get("last_name", "")
 
     @cached_property
     def email(self):
@@ -299,7 +300,7 @@ class Profile(models.Model):
 
     @cached_property
     def profile_image_url(self):
-        return self._cached_info["profile_image_url"]
+        return self._cached_info.get("profile_image_url")
 
     @cached_property
     def count_unseen_notifications(self):
diff --git a/judge/models/submission.py b/judge/models/submission.py
index 00c5941..5bc6863 100644
--- a/judge/models/submission.py
+++ b/judge/models/submission.py
@@ -221,12 +221,6 @@ class Submission(models.Model):
         return self.get_id_secret(self.id)
 
     def is_accessible_by(self, profile):
-        from judge.utils.problems import (
-            user_completed_ids,
-            user_tester_ids,
-            user_editable_ids,
-        )
-
         if not profile:
             return False
 
@@ -236,15 +230,6 @@ class Submission(models.Model):
         if profile.id == self.user_id:
             return True
 
-        if problem_id in user_editable_ids(profile):
-            return True
-
-        if self.problem_id in user_completed_ids(profile):
-            if self.problem.is_public:
-                return True
-            if problem_id in user_tester_ids(profile):
-                return True
-
         if user.has_perm("judge.change_submission"):
             return True
 
@@ -258,6 +243,21 @@ class Submission(models.Model):
         if contest and contest.is_editable_by(user):
             return True
 
+        from judge.utils.problems import (
+            user_completed_ids,
+            user_tester_ids,
+            user_editable_ids,
+        )
+
+        if problem_id in user_editable_ids(profile):
+            return True
+
+        if self.problem_id in user_completed_ids(profile):
+            if self.problem.is_public:
+                return True
+            if problem_id in user_tester_ids(profile):
+                return True
+
         return False
 
     class Meta:
diff --git a/judge/views/blog.py b/judge/views/blog.py
index 0310e27..2e29127 100644
--- a/judge/views/blog.py
+++ b/judge/views/blog.py
@@ -23,7 +23,6 @@ from judge.models import (
 from judge.models.profile import Organization, OrganizationProfile
 from judge.utils.cachedict import CacheDict
 from judge.utils.diggpaginator import DiggPaginator
-from judge.utils.problems import user_completed_ids
 from judge.utils.tickets import filter_visible_tickets
 from judge.utils.views import TitleMixin
 from judge.views.feed import FeedView
diff --git a/judge/views/submission.py b/judge/views/submission.py
index 26300b0..7158c01 100644
--- a/judge/views/submission.py
+++ b/judge/views/submission.py
@@ -41,7 +41,6 @@ from judge.models import ProblemTranslation
 from judge.models import Profile
 from judge.models import Submission
 from judge.utils.problems import get_result_data
-from judge.utils.problems import user_completed_ids, user_editable_ids, user_tester_ids
 from judge.utils.problem_data import get_problem_case
 from judge.utils.raw_sql import join_sql_subquery, use_straight_join
 from judge.utils.views import DiggPaginatorMixin