diff --git a/api/public/v1/serializers.py b/api/public/v1/serializers.py
index ad95db7558..2f783694c4 100644
--- a/api/public/v1/serializers.py
+++ b/api/public/v1/serializers.py
@@ -16,3 +16,7 @@ class Meta:
             "state",
         )
         fields = read_only_fields + ("user_provided_base_sha",)
+
+
+class PullIdSerializer(serializers.Serializer):
+    pullid = serializers.IntegerField()
diff --git a/api/public/v1/tests/views/test_pull_viewset.py b/api/public/v1/tests/views/test_pull_viewset.py
index cdbda1fffb..f83e2b4386 100644
--- a/api/public/v1/tests/views/test_pull_viewset.py
+++ b/api/public/v1/tests/views/test_pull_viewset.py
@@ -133,3 +133,10 @@ def test_post_pull_user_provided_base(self, pulls_sync_mock):
         )
         self.assertEqual(response.status_code, 405)
         assert not pulls_sync_mock.called
+
+    def test_get_pull_no_pullid_provided(self):
+        self.client.credentials(HTTP_AUTHORIZATION="Token " + self.repo.upload_token)
+        response = self.client.get("/api/github/codecov/testRepoName/pulls/abc")
+        self.assertEqual(response.status_code, 400)
+        content = json.loads(response.content.decode())
+        self.assertEqual(content["pullid"], ["A valid integer is required."])
diff --git a/api/public/v1/views.py b/api/public/v1/views.py
index 37a45ec68c..b2e8546812 100644
--- a/api/public/v1/views.py
+++ b/api/public/v1/views.py
@@ -1,17 +1,17 @@
 import logging
 
-from django.db.models import OuterRef, Subquery
+from django.db.models import OuterRef, QuerySet, Subquery
 from django.shortcuts import get_object_or_404
 from django_filters.rest_framework import DjangoFilterBackend
 from rest_framework import filters, mixins, viewsets
 
 from api.shared.mixins import RepoPropertyMixin
 from codecov_auth.authentication.repo_auth import RepositoryLegacyTokenAuthentication
-from core.models import Commit
+from core.models import Commit, Pull
 from services.task import TaskService
 
 from .permissions import PullUpdatePermission
-from .serializers import PullSerializer
+from .serializers import PullIdSerializer, PullSerializer
 
 log = logging.getLogger(__name__)
 
@@ -30,8 +30,11 @@ class PullViewSet(
     authentication_classes = [RepositoryLegacyTokenAuthentication]
     permission_classes = [PullUpdatePermission]
 
-    def get_object(self):
-        pullid = self.kwargs.get("pk")
+    def get_object(self) -> Pull:
+        serializer = PullIdSerializer(data={"pullid": self.kwargs.get("pk")})
+        serializer.is_valid(raise_exception=True)
+        pullid = serializer.validated_data["pullid"]
+
         if self.request.method == "PUT":
             # Note: We create a new pull if needed to make sure that they can be updated
             # with a base before the upload has finished processing.
@@ -41,7 +44,7 @@ def get_object(self):
             return obj
         return get_object_or_404(self.get_queryset(), pullid=pullid)
 
-    def get_queryset(self):
+    def get_queryset(self) -> QuerySet:
         return self.repo.pull_requests.annotate(
             ci_passed=Subquery(
                 Commit.objects.filter(
@@ -50,7 +53,7 @@ def get_queryset(self):
             )
         )
 
-    def perform_update(self, serializer):
+    def perform_update(self, serializer: PullSerializer) -> Pull:
         result = super().perform_update(serializer)
         TaskService().pulls_sync(repoid=self.repo.repoid, pullid=self.kwargs.get("pk"))
         return result
diff --git a/api/public/v2/compare/serializers.py b/api/public/v2/compare/serializers.py
index 043fdf1ba3..e85843fe66 100644
--- a/api/public/v2/compare/serializers.py
+++ b/api/public/v2/compare/serializers.py
@@ -16,10 +16,11 @@ class ComparisonSerializer(BaseComparisonSerializer):
 
     def get_files(self, comparison: Comparison) -> List[dict]:
         data = []
-        for filename in comparison.head_report.files:
-            file = comparison.get_file_comparison(filename, bypass_max_diff=True)
-            if self._should_include_file(file):
-                data.append(FileComparisonSerializer(file).data)
+        if comparison.head_report is not None:
+            for filename in comparison.head_report.files:
+                file = comparison.get_file_comparison(filename, bypass_max_diff=True)
+                if self._should_include_file(file):
+                    data.append(FileComparisonSerializer(file).data)
         return data