Recover from world gen error.

src/main/java/com/plotsquared/bukkit/generator/BukkitPlotPopulator.java

@@ -26,6 +26,7 @@ public abstract class BukkitPlotPopulator extends BlockPopulator {
     
     @Override
     public void populate(final World world, final Random rand, final Chunk chunk) {
+        try {
             this.world = world;
             worldname = world.getName();
             X = chunk.getX() << 4;
@@ -59,6 +60,10 @@ public abstract class BukkitPlotPopulator extends BlockPopulator {
                 }
             }
         }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
     
     public abstract void populate(final World world, final RegionWrapper requiredRegion, final PseudoRandom random, final int cx, final int cz);