diff --git a/src/main/java/featurecat/lizzie/rules/BoardHistoryList.java b/src/main/java/featurecat/lizzie/rules/BoardHistoryList.java
index 4ecee7644..30ba2b81c 100644
--- a/src/main/java/featurecat/lizzie/rules/BoardHistoryList.java
+++ b/src/main/java/featurecat/lizzie/rules/BoardHistoryList.java
@@ -29,6 +29,13 @@ public void setGameInfo(GameInfo gameInfo) {
         this.gameInfo = gameInfo;
     }
 
+    public BoardHistoryList shallowCopy() {
+        BoardHistoryList copy = new BoardHistoryList(null);
+        copy.head = head;
+        copy.gameInfo = gameInfo;
+        return copy;
+    }
+
     /**
      * Clear history.
      */
diff --git a/src/main/java/featurecat/lizzie/rules/SGFParser.java b/src/main/java/featurecat/lizzie/rules/SGFParser.java
index dbe5e5f16..61853d1db 100644
--- a/src/main/java/featurecat/lizzie/rules/SGFParser.java
+++ b/src/main/java/featurecat/lizzie/rules/SGFParser.java
@@ -217,7 +217,7 @@ public static void save(Board board, String filename) throws IOException {
 
     private static void saveToStream(Board board, Writer writer) throws IOException {
         // collect game info
-        BoardHistoryList history = board.getHistory();
+        BoardHistoryList history = board.getHistory().shallowCopy();
         GameInfo gameInfo = history.getGameInfo();
         String playerBlack = gameInfo.getPlayerBlack();
         String playerWhite = gameInfo.getPlayerWhite();