Use endstone instead

src/de/steamwar/spectatesystem/util/WorldLoader.java

@@ -76,7 +76,7 @@ public class WorldLoader {
                 for(int z = teamZ; z < teamZ + sizeZ; z++){
                     BlockPosition pos = new BlockPosition(x, y, z);
                     cworld.removeTileEntity(pos);
-                    cworld.setTypeAndData(pos, Blocks.AIR.getBlockData(), 1042);
+                    cworld.setTypeAndData(pos, Blocks.END_STONE.getBlockData(), 1042);
                     cworld.getChunkProvider().flagDirty(pos);
                 }
             }