diff --git a/tesseract.lua b/tesseract.lua
index dee55a4..4f4b535 100644
--- a/tesseract.lua
+++ b/tesseract.lua
@@ -414,7 +414,7 @@ local function trans_dig(pos, node, digger)
 	local item = ItemStack(node.name)
 	local data_str = minetest.serialize(data)
 	item:set_metadata(data_str)
-	if not inv:add_item('main', item) then
+	if not inv:room_for_item('main', item) or not inv:add_item('main', item) then
 		return
 	end