diff --git a/nullptr/commander.py b/nullptr/commander.py
index 6b41a8e..980dfdd 100644
--- a/nullptr/commander.py
+++ b/nullptr/commander.py
@@ -87,7 +87,8 @@ class Commander(CommandLine):
       arg = None
     self.ship.mission = arg
     self.ship.mission_status = 'init'
-    self.ship.mission_state['traject'] =[]
+    if 'traject' in self.ship.mission_state:
+      del self.ship.mission_state['traject']
     self.centcom.start_mission(self.ship)
   
   def print_mission(self):