--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadFactory.java	Thu Sep 05 15:47:24 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadFactory.java	Thu Sep 05 17:15:04 2013 +0200
@@ -13,6 +13,7 @@
 import java.util.Calendar;
 import java.util.Date;
 import java.util.List;
+import java.util.Map;
 import java.util.TreeMap;
 
 import net.sf.ehcache.Cache;
@@ -508,15 +509,24 @@
         TreeMap<Double, MeasurementStation> stations,
         double km
     ) {
-        MeasurementStation station = stations.floorEntry(km).getValue();
-        if (station == null || !station.getRange().contains(km)) {
+        Map.Entry<Double, MeasurementStation> entry = stations.floorEntry(km);
+        if (entry == null) {
+            return null;
+        }
+        MeasurementStation station = entry.getValue();
+        if (station == null
+        || station.getRange() == null
+        || !station.getRange().contains(km)) {
             return null;
         }
 
         double endKm;
 
-        if (stations.ceilingEntry(km + 0.1d) != null) {
-            MeasurementStation nextStation = stations.ceilingEntry(km + 0.1d).getValue();
+        Map.Entry<Double, MeasurementStation> ceilingEntry =
+            stations.ceilingEntry(km + 0.1d);
+
+        if (ceilingEntry != null) {
+            MeasurementStation nextStation = ceilingEntry.getValue();
             endKm = nextStation.getRange().getA().doubleValue();
         }
         else {