diff --git a/deutsche_bahn_api/timetable_helper.py b/deutsche_bahn_api/timetable_helper.py
index a2b67bf..3c5f8c5 100644
--- a/deutsche_bahn_api/timetable_helper.py
+++ b/deutsche_bahn_api/timetable_helper.py
@@ -125,7 +125,8 @@ def get_timetable_changes(self, trains: list) -> list[Train]:
                     new_message = Message()
                     new_message.id = message.attrib["id"]
                     new_message.code = message.attrib["c"]
-                    new_message.time = message.attrib["ts"]
+                    if "ts" in message.attrib:
+                        new_message.time = message.attrib["ts"]
                     new_message.message = resolve_message_by_code(int(message.attrib["c"]))
                     train_changes.messages.append(new_message)