fix mod events triggering during game save in Stardew Valley 1.2

2 files changed, 13 insertions, 0 deletions

diff --git a/src/StardewModdingAPI/Context.cs b/src/StardewModdingAPI/Context.cs
index d737bd58..415b4aac 100644
--- a/src/StardewModdingAPI/Context.cs
+++ b/src/StardewModdingAPI/Context.cs
@@ -11,6 +11,9 @@ namespace StardewModdingAPI
         /// <summary>Whether a player save has been loaded.</summary>
         public static bool IsSaveLoaded => Game1.hasLoadedGame && !string.IsNullOrEmpty(Game1.player.name);
 
+        /// <summary>Whether the game is currently writing to the save file.</summary>
+        public static bool IsSaving => SaveGame.IsProcessing;
+
         /// <summary>Whether the game is currently running the draw loop.</summary>
         public static bool IsInDrawLoop { get; set; }
     }
diff --git a/src/StardewModdingAPI/Framework/SGame.cs b/src/StardewModdingAPI/Framework/SGame.cs
index 7e04c391..fe7d3aa3 100644
--- a/src/StardewModdingAPI/Framework/SGame.cs
+++ b/src/StardewModdingAPI/Framework/SGame.cs
@@ -223,6 +223,16 @@ namespace StardewModdingAPI.Framework
                 return;
             }
 
+            // While the game is writing to the save file in the background, mods can unexpectedly
+            // fail since they don't have exclusive access to resources (e.g. collection changed
+            // during enumeration errors). To avoid problems, events are not invoked while a save
+            // is in progress.
+            if (Context.IsSaving)
+            {
+                base.Update(gameTime);
+                return;
+            }
+
             // raise game loaded
             if (this.FirstUpdate)
             {