diff --git a/lib/xmet/raob.py b/lib/xmet/raob.py
index c358f03..c1c8dc9 100644
--- a/lib/xmet/raob.py
+++ b/lib/xmet/raob.py
@@ -363,7 +363,7 @@ class RAOBObs():
         #
         # Return None if there is no station identifier.
         #
-        if self.tokens[1][0:3] == 'NIL':
+        if self.tokens[1][0:3] == 'NIL' or len(self.tokens) < 5:
             return None
 
         timestamp = self.tokens[0]