diff --git a/game-app/game-core/src/main/java/games/strategy/engine/data/GameData.java b/game-app/game-core/src/main/java/games/strategy/engine/data/GameData.java
index 02aa4608d66..33a0310ec1f 100644
--- a/game-app/game-core/src/main/java/games/strategy/engine/data/GameData.java
+++ b/game-app/game-core/src/main/java/games/strategy/engine/data/GameData.java
@@ -358,6 +358,15 @@ public void setHistory(final History history) {
 
   public void resetHistory() {
     gameHistory = new History(this);
+    GameStep step = getSequence().getStep();
+    // Put the history in a round and step, so that child nodes can be added without errors.
+    gameHistory
+        .getHistoryWriter()
+        .startNextStep(
+            step.getName(),
+            step.getDelegate().getName(),
+            step.getPlayerId(),
+            step.getDisplayName());
   }
 
   /** Not to be called by mere mortals. */
diff --git a/game-app/game-core/src/main/java/games/strategy/engine/framework/GameDataManager.java b/game-app/game-core/src/main/java/games/strategy/engine/framework/GameDataManager.java
index a1271205860..0f397947144 100644
--- a/game-app/game-core/src/main/java/games/strategy/engine/framework/GameDataManager.java
+++ b/game-app/game-core/src/main/java/games/strategy/engine/framework/GameDataManager.java
@@ -227,7 +227,7 @@ public static void saveGameUncompressed(
     // write to temporary file first in case of error
     try (ObjectOutputStream outStream = new ObjectOutputStream(sink)) {
       outStream.writeObject(engineVersion);
-      try (GameData.Unlocker ignored = data.acquireReadLock()) {
+      try (GameData.Unlocker ignored = data.acquireWriteLock()) {
         final var history = data.getHistory();
         if (!options.withHistory) {
           data.resetHistory();