diff --git a/docs/release-notes.md b/docs/release-notes.md
index ca47a687..eacf0955 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -4,6 +4,9 @@
   * Added `world_clear` console command to remove spawned or placed entities.
   * Tweaked installer to reduce antivirus false positives.
 
+* For modders:
+  * You can now use `ReadSaveData` or `WriteSaveData` immediately after the save is loaded, before the in-game world is initialised.
+
 ## 2.9.3
 * For players:
   * Fixed errors hovering items in some cases with SMAPI 2.9.2.
diff --git a/src/SMAPI/Framework/ModHelpers/DataHelper.cs b/src/SMAPI/Framework/ModHelpers/DataHelper.cs
index e5100aed..242b8ab1 100644
--- a/src/SMAPI/Framework/ModHelpers/DataHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/DataHelper.cs
@@ -77,9 +77,9 @@ namespace StardewModdingAPI.Framework.ModHelpers
         /// <exception cref="InvalidOperationException">The player hasn't loaded a save file yet or isn't the main player.</exception>
         public TModel ReadSaveData<TModel>(string key) where TModel : class
         {
-            if (!Context.IsSaveLoaded)
+            if (!Game1.hasLoadedGame)
                 throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.ReadSaveData)} when a save file isn't loaded.");
-            if (!Context.IsMainPlayer)
+            if (!Game1.IsMasterGame)
                 throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.ReadSaveData)} because this isn't the main player. (Save files are stored on the main player's computer.)");
 
             return Game1.CustomData.TryGetValue(this.GetSaveFileKey(key), out string value)
@@ -94,9 +94,9 @@ namespace StardewModdingAPI.Framework.ModHelpers
         /// <exception cref="InvalidOperationException">The player hasn't loaded a save file yet or isn't the main player.</exception>
         public void WriteSaveData<TModel>(string key, TModel data) where TModel : class
         {
-            if (!Context.IsSaveLoaded)
+            if (!Game1.hasLoadedGame)
                 throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.WriteSaveData)} when a save file isn't loaded.");
-            if (!Context.IsMainPlayer)
+            if (!Game1.IsMasterGame)
                 throw new InvalidOperationException($"Can't use {nameof(IMod.Helper)}.{nameof(IModHelper.Data)}.{nameof(this.ReadSaveData)} because this isn't the main player. (Save files are stored on the main player's computer.)");
 
             string internalKey = this.GetSaveFileKey(key);