diff --git a/authentik/lib/tests/__init__.py b/authentik/lib/tests/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/authentik/lib/tests.py b/authentik/lib/tests/test_serializer_model.py
similarity index 100%
rename from authentik/lib/tests.py
rename to authentik/lib/tests/test_serializer_model.py
diff --git a/authentik/providers/saml/tests/test_utils_time.py b/authentik/lib/tests/test_utils_time.py
similarity index 90%
rename from authentik/providers/saml/tests/test_utils_time.py
rename to authentik/lib/tests/test_utils_time.py
index 419d205e9..cc16550e1 100644
--- a/authentik/providers/saml/tests/test_utils_time.py
+++ b/authentik/lib/tests/test_utils_time.py
@@ -20,6 +20,8 @@ class TestTimeUtils(TestCase):
         """Test invalid expression"""
         with self.assertRaises(ValueError):
             timedelta_from_string("foo")
+        with self.assertRaises(ValueError):
+            timedelta_from_string("bar=baz")
 
     def test_validation(self):
         """Test Django model field validator"""
diff --git a/authentik/lib/utils/time.py b/authentik/lib/utils/time.py
index 4ba41ddb5..a4109f5af 100644
--- a/authentik/lib/utils/time.py
+++ b/authentik/lib/utils/time.py
@@ -35,4 +35,6 @@ def timedelta_from_string(expr: str) -> datetime.timedelta:
         if key.lower() not in ALLOWED_KEYS:
             continue
         kwargs[key.lower()] = float(value)
+    if len(kwargs) < 1:
+        raise ValueError("No valid keys to pass to timedelta")
     return datetime.timedelta(**kwargs)