diff --git a/turtles/mine.lua b/turtles/mine.lua
index 09dfe11..35c4d91 100644
--- a/turtles/mine.lua
+++ b/turtles/mine.lua
@@ -262,10 +262,13 @@ 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 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