diff --git a/OpenUtau.Core/Format/USTx.cs b/OpenUtau.Core/Format/USTx.cs
index 65b08d1c6..a27888054 100644
--- a/OpenUtau.Core/Format/USTx.cs
+++ b/OpenUtau.Core/Format/USTx.cs
@@ -94,19 +94,28 @@ public static UProject Create() {
         }
 
         public static void Save(string filePath, UProject project) {
-            project.ustxVersion = kUstxVersion;
-            project.FilePath = filePath;
-            project.BeforeSave();
-            File.WriteAllText(filePath, Yaml.DefaultSerializer.Serialize(project), Encoding.UTF8);
-            project.Saved = true;
-            project.AfterSave();
+            try {
+                project.ustxVersion = kUstxVersion;
+                project.FilePath = filePath;
+                project.BeforeSave();
+                File.WriteAllText(filePath, Yaml.DefaultSerializer.Serialize(project), Encoding.UTF8);
+                project.Saved = true;
+                project.AfterSave();
+            } catch (Exception ex) {
+                var e = new MessageCustomizableException("Failed to save ustx: {filePath}", $"<translate:errors.failed.save>: {filePath}", ex);
+                DocManager.Inst.ExecuteCmd(new ErrorMessageNotification(e));
+            }
         }
 
         public static void AutoSave(string filePath, UProject project) {
-            project.ustxVersion = kUstxVersion;
-            project.BeforeSave();
-            File.WriteAllText(filePath, Yaml.DefaultSerializer.Serialize(project), Encoding.UTF8);
-            project.AfterSave();
+            try {
+                project.ustxVersion = kUstxVersion;
+                project.BeforeSave();
+                File.WriteAllText(filePath, Yaml.DefaultSerializer.Serialize(project), Encoding.UTF8);
+                project.AfterSave();
+            } catch (Exception ex) {
+                Log.Error(ex, $"Failed to autosave: {filePath}");
+            }
         }
 
         public static UProject Load(string filePath) {
diff --git a/OpenUtau.Core/Ustx/UTrack.cs b/OpenUtau.Core/Ustx/UTrack.cs
index c12a3db7e..841d0d707 100644
--- a/OpenUtau.Core/Ustx/UTrack.cs
+++ b/OpenUtau.Core/Ustx/UTrack.cs
@@ -223,7 +223,11 @@ public bool ValidateVoiceColor(out string[] oldColors, out string[] newColors) {
         public void BeforeSave() {
             singer = Singer?.Id;
             phonemizer = Phonemizer.GetType().FullName;
-            VoiceColorNames = VoiceColorExp.options.ToArray();
+            if (Singer != null && Singer.Found && VoiceColorExp != null && VoiceColorExp.options.Length > 0) {
+                VoiceColorNames = VoiceColorExp.options.ToArray();
+            } else {
+                VoiceColorNames = new string[] { "" };
+            }
         }
 
         public void AfterLoad(UProject project) {