diff --git a/authentik/events/apps.py b/authentik/events/apps.py
index f0eb77c9c..e033b747c 100644
--- a/authentik/events/apps.py
+++ b/authentik/events/apps.py
@@ -4,7 +4,7 @@ from importlib import import_module
 
 from django.apps import AppConfig
 from django.db import ProgrammingError
-from django.utils.timezone import datetime
+from django.utils.timezone import now
 
 
 class AuthentikEventsConfig(AppConfig):
@@ -19,7 +19,7 @@ class AuthentikEventsConfig(AppConfig):
         try:
             from authentik.events.models import Event
 
-            date_from = datetime.now() - timedelta(days=1)
+            date_from = now() - timedelta(days=1)
 
             for event in Event.objects.filter(created__gte=date_from):
                 event._set_prom_metrics()
diff --git a/authentik/flows/challenge.py b/authentik/flows/challenge.py
index f353559b5..233325eeb 100644
--- a/authentik/flows/challenge.py
+++ b/authentik/flows/challenge.py
@@ -35,7 +35,7 @@ class Challenge(PassiveSerializer):
     type = ChoiceField(
         choices=[(x.value, x.name) for x in ChallengeTypes],
     )
-    title = CharField(required=False)
+    title = CharField(required=False, allow_blank=True)
     background = CharField(required=False)
     component = CharField(default="")
 
diff --git a/authentik/flows/planner.py b/authentik/flows/planner.py
index 718f64cfa..65f2e24cb 100644
--- a/authentik/flows/planner.py
+++ b/authentik/flows/planner.py
@@ -26,7 +26,7 @@ PLAN_CONTEXT_SOURCE = "source"
 GAUGE_FLOWS_CACHED = UpdatingGauge(
     "authentik_flows_cached",
     "Cached flows",
-    update_func=lambda: len(cache.keys("flow_*")),
+    update_func=lambda: len(cache.keys("flow_*") or []),
 )
 HIST_FLOWS_PLAN_TIME = Histogram(
     "authentik_flows_plan_time",
diff --git a/authentik/policies/engine.py b/authentik/policies/engine.py
index 99f27b1d5..1377d8228 100644
--- a/authentik/policies/engine.py
+++ b/authentik/policies/engine.py
@@ -25,7 +25,7 @@ CURRENT_PROCESS = current_process()
 GAUGE_POLICIES_CACHED = UpdatingGauge(
     "authentik_policies_cached",
     "Cached Policies",
-    update_func=lambda: len(cache.keys("policy_*")),
+    update_func=lambda: len(cache.keys("policy_*") or []),
 )
 HIST_POLICIES_BUILD_TIME = Histogram(
     "authentik_policies_build_time",
diff --git a/authentik/stages/prompt/stage.py b/authentik/stages/prompt/stage.py
index e818a6c52..6a90f66b1 100644
--- a/authentik/stages/prompt/stage.py
+++ b/authentik/stages/prompt/stage.py
@@ -33,7 +33,7 @@ class StagePromptSerializer(PassiveSerializer):
     label = CharField(allow_blank=True)
     type = CharField()
     required = BooleanField()
-    placeholder = CharField()
+    placeholder = CharField(allow_blank=True)
     order = IntegerField()
 
 
diff --git a/tests/e2e/test_flows_enroll.py b/tests/e2e/test_flows_enroll.py
index e1dee33bc..82a22d912 100644
--- a/tests/e2e/test_flows_enroll.py
+++ b/tests/e2e/test_flows_enroll.py
@@ -78,6 +78,7 @@ class TestFlowsEnroll(SeleniumTestCase):
         flow = Flow.objects.create(
             name="default-enrollment-flow",
             slug="default-enrollment-flow",
+            title="default-enrollment-flow",
             designation=FlowDesignation.ENROLLMENT,
         )
 
@@ -154,6 +155,7 @@ class TestFlowsEnroll(SeleniumTestCase):
         flow = Flow.objects.create(
             name="default-enrollment-flow",
             slug="default-enrollment-flow",
+            title="default-enrollment-flow",
             designation=FlowDesignation.ENROLLMENT,
         )