diff --git a/src/safeds/data/image/containers/_empty_image_list.py b/src/safeds/data/image/containers/_empty_image_list.py
index d15c062b9..799ecd670 100644
--- a/src/safeds/data/image/containers/_empty_image_list.py
+++ b/src/safeds/data/image/containers/_empty_image_list.py
@@ -41,7 +41,7 @@ class _EmptyImageList(ImageList):
     | [from_files][safeds.data.image.containers._image_list.ImageList.from_files]   | Create an ImageList from a directory or a list of files. |
     """
 
-    _instance: _EmptyImageList | None = None
+    _instance = None
 
     @staticmethod
     def _warn_empty_image_list() -> None:
diff --git a/src/safeds/data/tabular/containers/_time_series.py b/src/safeds/data/tabular/containers/_time_series.py
index 739daddbb..9be5b81e7 100644
--- a/src/safeds/data/tabular/containers/_time_series.py
+++ b/src/safeds/data/tabular/containers/_time_series.py
@@ -269,6 +269,8 @@ def __init__(
         if len(self.target._data) == 0:
             self.target._data = pd.Series(name=target_name)
 
+        self._data = _data._data
+
     def __eq__(self, other: object) -> bool:
         """
         Compare two time series instances.