Fix future history bug

diff --git a/js/game.js b/js/game.js
index 63b632e..1901aba 100644
--- a/js/game.js
+++ b/js/game.js
@@ -1071,6 +1071,8 @@ class Game
         this.describeMainCharacterLocation();
         if (this.history.length == 0) {
             elt('previous-history').disabled = true;
+        } else {
+            elt('previous-history').disabled = false;
         }
         elt('next-history').disabled = false;
     }
@@ -1094,6 +1096,8 @@ class Game
         this.describeMainCharacterLocation();
         if (this.future_history.length == 0) {
             elt('next-history').disabled = true;
+        } else {
+            elt('next-history').disabled = false;
         }
         elt('previous-history').disabled = false;
     }
@@ -1416,7 +1420,9 @@ class Game
 async function initGame()
 {
     game = new Game();
+    let use_session = false;
     if (sessionStorage["current" + game.id]) {
+        use_session = true;
         game.restoreState(sessionStorage["current" + game.id]);
     }
     game.takeTurn("");