HIGH: Crash because of uninitialized properties

Console Window Log:

Nasal getValue: property /velocities[0]/vertical-speed-fps[0] is NaN
Nasal runtime error: nil used in numeric context
  at /mnt/mm/flightgear-data/aircrafts-misc/ec130/Nasal/ec130.nas, line 2284
Nasal getprop: property /velocities[0]/airspeed-kt[0] is NaN
Nasal runtime error: nil used in numeric context
  at /mnt/mm/flightgear-data/aircrafts-misc/ec130/Nasal/ec130.nas, line 1119
Nasal getValue: property /orientation[0]/roll-deg[0] is NaN
Nasal runtime error: nil used in numeric context
  at /mnt/mm/flightgear-data/aircrafts-misc/ec130/Systems/kcs55.nas, line 119
  called from: /mnt/mm/flightgear-data/aircrafts-misc/ec130/Systems/kcs55.nas, line 428
  called from: /mnt/mm/flightgear-data/aircrafts-misc/ec130/Systems/kcs55.nas, line 433
AL Error (sound manager): Invalid Value at generate buffer