diff --git a/public/images/layers.png b/public/images/layers.png
index eddf642..54933be 100644
Binary files a/public/images/layers.png and b/public/images/layers.png differ
diff --git a/src/entities/tile.coffee b/src/entities/tile.coffee
index 2d07728..ca69c72 100644
--- a/src/entities/tile.coffee
+++ b/src/entities/tile.coffee
@@ -25,9 +25,11 @@ class Tile extends BaseEntity
       else
         @currentLayer += 1
 
-        if @currentLayer > app.game.resources.length
+        if @currentLayer > Object.keys(app.game.resources).length
           @died = true
 
+          @currentMiner = null if @currentMiner
+
   tick: ->
     @currentMiner.tick @