--- a/net/minecraft/server/PathfinderAbstract.java
+++ b/net/minecraft/server/PathfinderAbstract.java
@@ -23,7 +23,7 @@
         this.f = MathHelper.d(entityinsentient.width + 1.0F);
     }
 
-    public void a() {}
+    public void a() { this.a = (IBlockAccess) null; } // CraftBukkit - don't leak Chunk Cache
 
     protected PathPoint a(int i, int j, int k) {
         int l = PathPoint.b(i, j, k);