diff --git a/pyrmv/classes/Trip.py b/pyrmv/classes/Trip.py
index d6eced9..cc463ab 100644
--- a/pyrmv/classes/Trip.py
+++ b/pyrmv/classes/Trip.py
@@ -19,9 +19,18 @@ class Trip():
         self.id = data["tripId"]
         self.ctx_recon = data["ctxRecon"]
         self.duration = parse_duration(data["duration"])
-        self.real_time_duration = parse_duration(data["rtDuration"])
+
+        if "rtDuration" in data:
+            self.real_time_duration = parse_duration(data["rtDuration"])
+        else:
+            self.real_time_duration = None
+
         self.checksum = data["checksum"]
-        self.transfer_count = data["transferCount"]
+        
+        if "transferCount" in data:
+            self.transfer_count = data["transferCount"]
+        else:
+            self.transfer_count = 0
 
     def __str__(self) -> str:
         return f"Trip from {self.origin.name} to {self.destination.name} lasting {self.duration} ({self.real_time_duration}) with {len(self.legs)} legs and {self.transfer_count} transfers"
\ No newline at end of file