diff --git a/README.md b/README.md
index d6bdfcf..d0bf71b 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,9 @@
 More Blocks for [Minetest](https://www.minetest.net/), a free and open source infinite
 world block sandbox game.
 
-![Screenshot](./raw/master/screenshot.png)
+![Screenshot](./raw/bugfixes/screenshot.png)
 
-![Screenshot](./raw/master/screenshot2.png)
+![Screenshot](./raw/bugfixes/screenshot2.png)
 
 [Forum topic](https://forum.minetest.net/viewtopic.php?f=11&t=509)
 
diff --git a/stairsplus/util.lua b/stairsplus/util.lua
index 54215c8..512ce3d 100644
--- a/stairsplus/util.lua
+++ b/stairsplus/util.lua
@@ -40,13 +40,13 @@ stairsplus.util = {
 		end
 
 		for k1, v1 in pairs(t1) do
-			if not v1 == t2[k1] then
+			if v1 ~= t2[k1] then
 				return false
 			end
 		end
 
 		for k2, v2 in pairs(t2) do
-			if not t1[k2] == v2 then
+			if t1[k2] ~= v2 then
 				return false
 			end
 		end