diff --git a/src/pyrmv/classes/trip.py b/src/pyrmv/classes/trip.py
index dd41494..e62c6dc 100644
--- a/src/pyrmv/classes/trip.py
+++ b/src/pyrmv/classes/trip.py
@@ -19,8 +19,10 @@ class Trip:
         self.index: int = data["idx"]
         self.id: str = data["tripId"]
         self.ctx_recon: str = data["ctxRecon"]
-        self.duration: Union[Duration, timedelta] = parse_duration(data["duration"])
-        self.real_time_duration: Union[Duration, timedelta] = (
+        self.duration: Union[Duration, timedelta, None] = (
+            None if "duration" not in data else parse_duration(data["duration"])
+        )
+        self.real_time_duration: Union[Duration, timedelta, None] = (
             None if "rtDuration" not in data else parse_duration(data["rtDuration"])
         )
         self.checksum: str = data["checksum"]