diff --git a/Modules/circles.lua b/Modules/circles.lua
index 3c2b73e..f079dbc 100644
--- a/Modules/circles.lua
+++ b/Modules/circles.lua
@@ -49,7 +49,7 @@ end
 
 
 --place_row() places n block in a row
-function place_column(amount, material)
+function place_row(amount, material)
   turtle.turnRight()
   turtle.forward()
   turtle.turnLeft()
@@ -62,7 +62,7 @@ end
 
 
 --place_triangle() places a trinagular block
-function place_column(material)
+function place_triangle(material)
   turtle.turnRight()
   turtle.forward()
   turtle.turnLeft()
diff --git a/Modules/modules.lua b/Modules/modules.lua
index 2cfc220..1bae75a 100644
--- a/Modules/modules.lua
+++ b/Modules/modules.lua
@@ -40,7 +40,8 @@ function count_inventory(minecraft_id)
   local total = 0
 
   for slot = 1, 16 do
-    if turtle.getItemDetail(slot) == 'minecraft:' .. minecraft_id  then
+    item = turtle.getItemDetail(slot)
+    if item ~= nil and item['name'] == 'minecraft:' .. minecraft_id  then
       total = total + turtle.getItem(slot)
     end
   end