diff --git a/PhonemizerOnUtau/Program.cs b/PhonemizerOnUtau/Program.cs
index dadc67c63..3fb2bc415 100644
--- a/PhonemizerOnUtau/Program.cs
+++ b/PhonemizerOnUtau/Program.cs
@@ -52,6 +52,14 @@
     var singer = new ClassicSinger(voicebank);
     singer.EnsureLoaded();
 
+    //Check if the user has selected any note
+    if(IsEmptyProject(plugin)) {
+        Console.WriteLine("Please select some notes before running this plugin.");
+        Console.WriteLine("Press Enter to exit.");
+        Console.ReadLine();
+        return;
+    }
+
     //Parse notes and tempos
     var myNotes = UtauUtil.PluginNotesToMyNotes(plugin);
     var tempos = UtauUtil.GetTempoList(plugin, myNotes);
@@ -181,7 +189,7 @@
     bool hasPrev = plugin.note[0].GetNum() == "PREV";
     bool hasNext = plugin.note[^1].GetNum() == "NEXT";
     int insertLocation = hasPrev ? 1 : 0;
-    foreach (var pluginNoteIndex in Enumerable.Range(insertLocation, originalPluginNoteCount - (hasNext ? 1 : 0))) {
+    foreach (var pluginNoteIndex in Enumerable.Range(insertLocation, originalPluginNoteCount - insertLocation - (hasNext ? 1 : 0))) {
         plugin.DeleteNote(pluginNoteIndex);
     }
     currTick = 0;
@@ -213,6 +221,18 @@
     return;
 }
 
+bool IsEmptyProject(UtauPlugin plugin){
+    if(plugin.note.Count == 0){
+        return true;
+    }
+    bool hasPrev = plugin.note[0].GetNum() == "PREV";
+    bool hasNext = plugin.note[^1].GetNum() == "NEXT";
+    if(plugin.note.Count - (hasPrev ? 1 : 0) - (hasNext ? 1 : 0) == 0) {
+        return true;
+    }
+    return false;
+}
+
 bool TryParsePhonemizerGroup(
     List<IGrouping<string, PhonemizerFactory>> phonemizerGroups, 
     string input,