Correction to blend configuration.

src/engine/objects/Zone.java

@@ -190,8 +190,13 @@ public class Zone extends AbstractGameObject {
 
         // Set heightmap blending bounds
 
-        if (heightMap != null) {
         this.minBlend = Bounds.borrow();
+        this.maxBlend = Bounds.borrow();
+
+        if (heightMap == null) {
+            this.minBlend = this.getBounds();
+            this.maxBlend = this.getBounds();
+        } else {
             this.minBlend.setBounds(new Vector2f(this.absX, this.absZ), new Vector2f(Enum.CityBoundsType.ZONE.extents, Enum.CityBoundsType.ZONE.extents).subtract(heightMap.zone_minBlend, heightMap.zone_minBlend), 0.0f);
             this.maxBlend.setBounds(new Vector2f(this.absX, this.absZ), new Vector2f(Enum.CityBoundsType.ZONE.extents, Enum.CityBoundsType.ZONE.extents).subtract(heightMap.zone_maxBlend, heightMap.zone_maxBlend), 0.0f);
         }