[game] An error occurred in the base update loop: NullReferenceException: Object reference not set to an instance of an object.
   at StardewValley.Menus.LetterViewerMenu..ctor_PatchedBy<Esca.CustomNPCExclusions>(LetterViewerMenu this, String mail, String mailTitle, Boolean fromCollection)
   at StardewValley.GameLocation.mailbox()
   at StardewValley.GameLocation.performAction_PatchedBy<FlashShifter.SVECode__spacechase0.BiggerBackpack__spacechase0.SpaceCore>(GameLocation this, String action, Farmer who, Location tileLocation)
   at StardewValley.GameLocation.checkAction(Location tileLocation, Rectangle viewport, Farmer who)
   at StardewValley.Locations.BuildableGameLocation.checkAction(Location tileLocation, Rectangle viewport, Farmer who)
   at StardewValley.Farm.checkAction(Location tileLocation, Rectangle viewport, Farmer who)
   at StardewValley.Game1.<>c__DisplayClass859_0.<tryToCheckAt>b__0()
   at StardewValley.Game1.tryToCheckAt(Vector2 grabTile, Farmer who)
   at StardewValley.Game1.pressActionButton(KeyboardState currentKBState, MouseState currentMouseState, GamePadState currentPadState)
   at StardewValley.Game1.<>c__DisplayClass913_0.<UpdateControlInput>b__0()
   at StardewValley.Game1.UpdateControlInput(GameTime time)
   at StardewValley.Game1._update(GameTime gameTime)
   at StardewValley.Game1.Update(GameTime gameTime)
   at StardewModdingAPI.Framework.SCore.OnPlayerInstanceUpdating(SGame instance, GameTime gameTime, Action runUpdate)