From a52b9313f87d0ca68ea3dd652a94591f3de5a186 Mon Sep 17 00:00:00 2001
From: charlestian23 <charles.tian23@gmail.com>
Date: Fri, 29 Sep 2023 16:42:01 -0400
Subject: [PATCH] Fixed a bug where file wouldn't save due to batch grader
 updates

---
 src/main/java/edu/rpi/legup/model/Puzzle.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main/java/edu/rpi/legup/model/Puzzle.java b/src/main/java/edu/rpi/legup/model/Puzzle.java
index 9467afc5b..38b0d8e6b 100644
--- a/src/main/java/edu/rpi/legup/model/Puzzle.java
+++ b/src/main/java/edu/rpi/legup/model/Puzzle.java
@@ -220,6 +220,9 @@ public boolean isValidTextInput(String[] statements) {
      * @return true if the board was solved correctly, false otherwise
      */
     public boolean isPuzzleComplete() {
+        if (tree == null)
+            return false;
+
         boolean isComplete = tree.isValid();
         if (isComplete) {
             for (TreeElement leaf : tree.getLeafTreeElements()) {