diff --git a/AndorsTrail/src/com/gpl/rpg/AndorsTrail/model/map/PredefinedMap.java b/AndorsTrail/src/com/gpl/rpg/AndorsTrail/model/map/PredefinedMap.java
index b13269174..f3bb09e85 100644
--- a/AndorsTrail/src/com/gpl/rpg/AndorsTrail/model/map/PredefinedMap.java
+++ b/AndorsTrail/src/com/gpl/rpg/AndorsTrail/model/map/PredefinedMap.java
@@ -64,6 +64,16 @@ public final class PredefinedMap {
 		assert(size.height > 0);
 		this.isOutdoors = isOutdoors;
 		this.initialColorFilter = colorFilter;
+
+		if (AndorsTrailApplication.DEVELOPMENT_VALIDATEDATA) {
+			for (int i = 0; i < spawnAreas.length; i++) {
+				for (int j = i + 1; j < spawnAreas.length; j++) {
+					if (spawnAreas[i].areaID.equals(spawnAreas[j].areaID)) {
+						L.log("WARNING: duplicate areaID " + spawnAreas[i].areaID + " in map " + this.name);
+					}
+				}
+			}
+		}
 	}
 
 	public final boolean isOutside(final Coord p) { return isOutside(p.x, p.y); }