diff --git a/db/xmet.sql b/db/xmet.sql
index 5d981b1..ce635dd 100644
--- a/db/xmet.sql
+++ b/db/xmet.sql
@@ -95,7 +95,7 @@ create table xmet_igra_station (
     year_start INTEGER NOT NULL,
     year_end   INTEGER NOT NULL,
     name       TEXT NOT NULL,
-    state      TEXT NOT NULL,
+    state      TEXT,
     elevation  FLOAT NOT NULL
 );
 
diff --git a/lib/xmet/igra.py b/lib/xmet/igra.py
index e2ac696..bdc9cd8 100644
--- a/lib/xmet/igra.py
+++ b/lib/xmet/igra.py
@@ -243,6 +243,9 @@ class IGRAStation(DatabaseTable):
         station.elevation  = float(cols(line, 32, 37))
         station.location   = shapely.Point(lon, lat)
 
+        if station.state == '':
+            station.state = None
+
         return station
 
     @staticmethod