diff --git a/defADSBX.py b/defADSBX.py
index 101990c..6ce98bf 100644
--- a/defADSBX.py
+++ b/defADSBX.py
@@ -23,9 +23,14 @@ def pullADSBX(icao):
     ac = data['ac']
     if ac != None:
       ac_dict = ac[0]
-      plane_Dict = {'icao' : ac_dict['icao'], 'callsign' : ac_dict['call'], 'reg' : ac_dict['reg'], 'latitude' : float(ac_dict['lat']), 'longitude' : float(ac_dict['lon']), 'geo_alt_ft' : int(ac_dict['galt']), 'on_ground' : bool(int(ac_dict["gnd"]))}
-      if plane_Dict['on_ground']:
-        plane_Dict['geo_alt_ft'] = 0
+      if ac_dict["gnd"] == 0 or 1:
+        plane_Dict = {'icao' : ac_dict['icao'], 'callsign' : ac_dict['call'], 'reg' : ac_dict['reg'], 'latitude' : float(ac_dict['lat']), 'longitude' : float(ac_dict['lon']), 'geo_alt_ft' : int(ac_dict['galt']), 'on_ground' : bool(int(ac_dict["gnd"]))}
+        if plane_Dict['on_ground']:
+          plane_Dict['geo_alt_ft'] = 0
+      else:
+        plane_Dict = None
+        failed = True
+        print("Got data but on_ground is invalid!")
     else:
       plane_Dict = None