1 files changed, 2 insertions, 2 deletions

diff --git a/rules.js b/rules.js
index 09f5a11..85c9861 100644
--- a/rules.js
+++ b/rules.js
@@ -78,7 +78,7 @@ function clear_undo() {
 
 function push_undo() {
 	game.undo.push(JSON.stringify(game, (k,v) => {
-		if (k === 'undo') return undefined;
+		if (k === 'undo') return 0;
 		if (k === 'log') return v.length;
 		return v;
 	}));
@@ -87,7 +87,7 @@ function push_undo() {
 function pop_undo() {
 	let undo = game.undo;
 	let save_log = game.log;
-	Object.assign(game, JSON.parse(undo.pop()));
+	game = JSON.parse(undo.pop());
 	game.undo = undo;
 	save_log.length = game.log;
 	game.log = save_log;