Update 2.0.12.0 fix

Author: KoraLyn

xivModdingFramework/Materials/FileTypes/Mtrl.cs

@@ -532,9 +532,16 @@ await Task.Run((Func<Task>)(async () =>
                             var offset = shaderParam.Offset;
                             var size = shaderParam.Size;
                             shaderParam.Bytes = new List<byte>();
-                            for(var idx = offset; idx < offset + size; idx++)
+                            if (offset + size <= shaderBytes.Length)
                             {
-                                shaderParam.Bytes.Add(shaderBytes[idx]);
+                                for (var idx = offset; idx < offset + size; idx++)
+                                {
+                                    shaderParam.Bytes.Add(shaderBytes[idx]);
+                                }
+                            } else
+                            {
+                                // Just use a blank array if we have missing/invalid shader data.
+                                shaderParam.Bytes = new List<byte>(new byte[size]);
                             }
                         }