diff --git a/turtles/mine.lua b/turtles/mine.lua
index aa5b416..a49a936 100644
--- a/turtles/mine.lua
+++ b/turtles/mine.lua
@@ -240,11 +240,14 @@ function is_block_precious(block)
     }
     if block then
         for id, refblock in ipairs(WORTHY_BLOCKS) do
-            if block['name'] == refblock['name'] then
-                if (refblock['state_type']
-                    and block['state'] and block['state']['type']
-                    and block['state']['type'] == refblock['state_type']) then
+            if block.name == refblock.name then
+                if refblock.state_type then
+                    if (block.state and block.state.type
+                        and block.state.type == refblock.state_type) then
                         return true
+                    end
+                else
+                    return true
                 end
             end
         end