diff --git a/src/mo2/stubs/generator/parser.py b/src/mo2/stubs/generator/parser.py
index e42c17a..f4eb4db 100644
--- a/src/mo2/stubs/generator/parser.py
+++ b/src/mo2/stubs/generator/parser.py
@@ -108,9 +108,12 @@ def parse_python_signature(s: str, name: str) -> tuple[PyType, list[Argument]]:
             raise ValueError(f"invalid argument: {pa}, {s}")
 
         matches = m.groupdict()
-        arguments.append(
-            Argument(matches["name"], PyType(matches["type"]), matches["value"])
-        )
+        type_ = matches["type"]
+        if matches["value"] == "None":
+            if "None" not in type_ and "MoVariant" not in type_:
+                type_ = type_ + " | None"
+
+        arguments.append(Argument(matches["name"], PyType(type_), matches["value"]))
 
     return PyType(return_type), arguments
 
diff --git a/stubs/2.5.0/mobase-stubs/__init__.pyi b/stubs/2.5.0/mobase-stubs/__init__.pyi
index 8281ad4..1c10d44 100644
--- a/stubs/2.5.0/mobase-stubs/__init__.pyi
+++ b/stubs/2.5.0/mobase-stubs/__init__.pyi
@@ -1639,7 +1639,7 @@ class IModList:
         """
         ...
     def allModsByProfilePriority(
-        self: IModList, profile: IProfile = None
+        self: IModList, profile: IProfile | None = None
     ) -> Sequence[str]:
         """
         Returns:
@@ -3818,7 +3818,7 @@ class ISaveGameInfoWidget(PyQt6.QtWidgets.QWidget):
     """
 
     def __init__(
-        self: ISaveGameInfoWidget, parent: PyQt6.QtWidgets.QWidget = None
+        self: ISaveGameInfoWidget, parent: PyQt6.QtWidgets.QWidget | None = None
     ) -> None:
         """
         Args:
diff --git a/stubs/2.5.0/mobase-stubs/widgets/__init__.pyi b/stubs/2.5.0/mobase-stubs/widgets/__init__.pyi
index 73f1cda..f745484 100644
--- a/stubs/2.5.0/mobase-stubs/widgets/__init__.pyi
+++ b/stubs/2.5.0/mobase-stubs/widgets/__init__.pyi
@@ -15,7 +15,7 @@ class TaskDialog:
 
     def __init__(
         self: TaskDialog,
-        parent: PyQt6.QtWidgets.QWidget = None,
+        parent: PyQt6.QtWidgets.QWidget | None = None,
         title: str = "",
         main: str = "",
         content: str = "",