diff --git a/worldedit/manipulations.lua b/worldedit/manipulations.lua
index ee73a2d..2fa9a1e 100644
--- a/worldedit/manipulations.lua
+++ b/worldedit/manipulations.lua
@@ -25,8 +25,11 @@ end
 
 --sets a region defined by positions `pos1` and `pos2` to `nodename`, returning the number of nodes filled
 worldedit.set = function(pos1, pos2, nodenames)
+    local oneNode
     if type(nodenames) == 'string' then
-        nodenames = {nodenames}
+        oneNode = true
+    else
+        oneNode = false
     end
 
 	local pos1, pos2 = worldedit.sort_pos(pos1, pos2)
@@ -48,10 +51,10 @@ worldedit.set = function(pos1, pos2, nodenames)
     for i,v in ipairs(nodenames) do
         node_ids[i] = minetest.get_content_id(nodenames[i])
     end
-	if #node_ids == 1 then --only one type of node
-		local id = node_ids[1]
+	if oneNode then --only one type of node
+		local id = node_ids
 		for i in area:iterp(pos1, pos2) do nodes[i] = id end --fill area with node
-	else --several tpyes of nodes specified
+	else --several types of nodes specified
 		local id_count, rand = #node_ids, math.random
 		for i in area:iterp(pos1, pos2) do nodes[i] = node_ids[rand(id_count)] end --fill randomly with all types of specified nodes
 	end
@@ -417,13 +420,19 @@ worldedit.stack = function(pos1, pos2, axis, count)
 	if count < 0 then
 		count = -count
 		length = -length
-	end
-	local amount = 0
-	local copy = worldedit.copy
-	for i = 1, count do
-		amount = amount + length
-		copy(pos1, pos2, axis, amount)
-	end
+    end
+    local amount = 0
+    local copy = worldedit.copy
+    local i = 1
+    function nextone() 
+        if i <= count then
+            i = i + 1
+            amount = amount + length
+            copy(pos1, pos2, axis, amount)
+            minetest.after(0,nextone)
+        end
+    end
+    nextone()
 	return worldedit.volume(pos1, pos2) * count
 end