diff --git a/keyosk/fields.py b/keyosk/fields.py
index 8f74dfa..5da914f 100644
--- a/keyosk/fields.py
+++ b/keyosk/fields.py
@@ -78,7 +78,7 @@ class PathString(msh.fields.String):
     """Translate between a string and a path object"""
 
     def _serialize(self, value: Union[str, Path], attr, obj, **kwargs) -> str:
-        return super()._serialize(str(value), attr, obj, **kwargs)
+        return super()._serialize(str(value) if value else value, attr, obj, **kwargs)
 
     def _deserialize(self, value: str, attr, data, **kwargs) -> Path:
         return Path(super()._deserialize(value, attr, data, **kwargs))
diff --git a/tests/test_fields.py b/tests/test_fields.py
index 464efa0..167886c 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -1,4 +1,6 @@
+import datetime
 import enum
+import time
 from pathlib import Path
 
 import marshmallow
@@ -135,3 +137,126 @@ def test_pathstring():
     for data in bad_data:
         with pytest.raises(marshmallow.ValidationError):
             serializer.load(data)
+
+
+def test_pathstring_none():
+    class TestSchema(marshmallow.Schema):
+        iampath = fields.PathString(allow_none=True)
+
+    good_data = [
+        {"iampath": "/etc/sooper/seekret/place.stuff"},
+        {"iampath": "fizzbuzz.foobar"},
+        {"iampath": None},
+    ]
+
+    serializer = TestSchema()
+
+    for item in good_data:
+        loaded = serializer.load(item)
+        if item["iampath"] is None:
+            assert loaded["iampath"] is None
+        else:
+            assert isinstance(loaded["iampath"], Path)
+        assert item == serializer.dump(loaded)
+
+
+def test_epoch():
+    class TestSchema(marshmallow.Schema):
+        iamepoch = fields.Epoch()
+
+    good_data = [
+        {"iamepoch": 123456789},
+        {"iamepoch": 0},
+        {"iamepoch": int(time.time())},
+    ]
+
+    bad_data = [
+        {"iamepoch": -1},
+        {"iamepoch": (1, 2, 3)},
+        {"iamepoch": datetime.datetime.utcnow()},
+        {"iamepoch": -1234},
+        {"iamepoch": None},
+    ]
+
+    serializer = TestSchema()
+
+    for data in good_data:
+        loaded = serializer.load(data)
+        assert isinstance(loaded["iamepoch"], datetime.datetime)
+        assert int(loaded["iamepoch"].timestamp()) == data["iamepoch"]
+        assert data == serializer.dump(loaded)
+
+    for data in bad_data:
+        with pytest.raises(marshmallow.ValidationError):
+            serializer.load(data)
+
+
+def test_epoch_none():
+    class TestSchema(marshmallow.Schema):
+        iamepoch = fields.Epoch(allow_none=True)
+
+    good_data = [
+        {"iamepoch": 123456789},
+        {"iamepoch": 0},
+        {"iamepoch": int(time.time())},
+        {"iamepoch": None},
+    ]
+
+    serializer = TestSchema()
+
+    for item in good_data:
+        loaded = serializer.load(item)
+        if item["iamepoch"] is None:
+            assert loaded["iamepoch"] is None
+        else:
+            assert isinstance(loaded["iamepoch"], datetime.datetime)
+            assert int(loaded["iamepoch"].timestamp()) == item["iamepoch"]
+        assert item == serializer.dump(loaded)
+
+
+def test_rawmultitype():
+    class TestSchema(marshmallow.Schema):
+        iamraw = fields.RawMultiType([str, bool, datetime.datetime, Path])
+
+    good_data = [
+        {"iamraw": "haveyoueverheardthetragedyofdarthplageiusthewise"},
+        {"iamraw": True},
+        {"iamraw": datetime.datetime.utcnow()},
+        {"iamraw": Path("/all", "your", "hackz", "are", "belong", "to", "me")},
+    ]
+
+    bad_data = [
+        {"iamraw": 1234},
+        {"iamraw": datetime.timedelta(seconds=30)},
+        {"iamraw": ["hello", "there"]},
+        {"iamraw": None},
+    ]
+
+    serializer = TestSchema()
+
+    for data in good_data:
+        loaded = serializer.load(data)
+        assert loaded == data
+        assert data == serializer.dump(loaded)
+
+    for data in bad_data:
+        with pytest.raises(marshmallow.ValidationError):
+            serializer.load(data)
+
+
+def test_rawmultitype_none():
+    class TestSchema(marshmallow.Schema):
+        iamraw = fields.RawMultiType([str, datetime.datetime], allow_none=True)
+
+    good_data = [
+        {"iamraw": "haveyoueverheardthetragedyofdarthplageiusthewise"},
+        {"iamraw": datetime.datetime.utcnow()},
+        {"iamraw": None},
+    ]
+
+    serializer = TestSchema()
+
+    for data in good_data:
+        loaded = serializer.load(data)
+        assert loaded == data
+        assert data == serializer.dump(loaded)