diff --git a/BizHawk.Client.Common/lua/LuaLibraryBase.cs b/BizHawk.Client.Common/lua/LuaLibraryBase.cs
index 38b488ed2e..e1be7fbded 100644
--- a/BizHawk.Client.Common/lua/LuaLibraryBase.cs
+++ b/BizHawk.Client.Common/lua/LuaLibraryBase.cs
@@ -27,12 +27,12 @@ namespace BizHawk.Client.Common
 
 		protected static int LuaInt(object luaArg)
 		{
-			return Convert.ToInt32((double)luaArg);
+			return (int)(double)luaArg;
 		}
 
 		protected static uint LuaUInt(object luaArg)
 		{
-			return Convert.ToUInt32((double)luaArg);
+			return (uint)(double)luaArg;
 		}
 
 		/// <summary>
diff --git a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs
index 0b34c592ba..650d8b8aa7 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/Libraries/EmuLuaLibrary.Gui.cs
@@ -132,9 +132,13 @@ namespace BizHawk.Client.EmuHawk
 			return p;
 		}
 
+		Bitmap nullGraphicsBitmap = new Bitmap(1, 1);
 		private Graphics GetGraphics()
 		{
-			var g = luaSurface.GetGraphics();
+			Graphics g;
+			if (luaSurface == null)
+				g = Graphics.FromImage(nullGraphicsBitmap);
+			else g = luaSurface.GetGraphics();
 			int tx = Global.Emulator.CoreComm.ScreenLogicalOffsetX;
 			int ty = Global.Emulator.CoreComm.ScreenLogicalOffsetY;
 			if (tx != 0 || ty != 0)