diff --git a/miner.lua b/miner.lua
index 5c3a53e..41705c9 100644
--- a/miner.lua
+++ b/miner.lua
@@ -145,7 +145,12 @@ local function mineProcedure()
 
   -- 1. Move
   if robotState.y > targetY then
-    turtle.digDown()
+    local ok, err = turtle.digDown()
+
+    if not ok then
+      error('Cannot dig down because ' .. err)
+    end
+
     miner.robot.down()
   elseif robotState.dir == 'FORWARD' and robotState.z < targetZ then
     turtleUtils.digAll()