diff --git a/PropUndoButton/Main.cs b/PropUndoButton/Main.cs
index c831b1a..5ab8ddc 100644
--- a/PropUndoButton/Main.cs
+++ b/PropUndoButton/Main.cs
@@ -30,6 +30,7 @@ public class PropUndoButton : MelonMod
     public const string sfx_undo = "PropUndo_sfx_undo";
     public const string sfx_redo = "PropUndo_sfx_redo";
     public const string sfx_warn = "PropUndo_sfx_warn";
+    public const string sfx_deny = "PropUndo_sfx_deny";
 
     public const int redoHistoryLimit = 20; // amount that can be in history at once
     public const int redoTimeoutLimit = 120; // seconds
@@ -71,7 +72,7 @@ public class PropUndoButton : MelonMod
         }
 
         // copy embedded resources to this folder if they do not exist
-        string[] clipNames = { "sfx_spawn.wav", "sfx_undo.wav", "sfx_redo.wav", "sfx_warn.wav" };
+        string[] clipNames = { "sfx_spawn.wav", "sfx_undo.wav", "sfx_redo.wav", "sfx_warn.wav", "sfx_deny.wav" };
         foreach (string clipName in clipNames)
         {
             string clipPath = Path.Combine(path, clipName);
@@ -156,6 +157,12 @@ public class PropUndoButton : MelonMod
 
         List<CVRSyncHelper.PropData> propsList = GetAllPropsByOwnerId();
 
+        if (propsList.Count == 0)
+        {
+            PlayAudioModule(sfx_warn);
+            return false;
+        }
+
         for (int i = propsList.Count - 1; i >= 0; i--)
         {
             CVRSyncHelper.PropData propData = propsList[i];
@@ -247,6 +254,10 @@ public class PropUndoButton : MelonMod
         {
             propData.Spawnable.Delete();
         }
+        else
+        {
+            PlayAudioModule(sfx_deny);
+        }
 
         //if an undo attempt is made right after spawning a prop, the 
         //spawnable & wrapper will both be null, so the delete request
diff --git a/PropUndoButton/PropUndoButton.csproj b/PropUndoButton/PropUndoButton.csproj
index 3b1889c..76fb8b1 100644
--- a/PropUndoButton/PropUndoButton.csproj
+++ b/PropUndoButton/PropUndoButton.csproj
@@ -10,6 +10,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+      <None Remove="SFX\sfx_deny.wav" />
       <None Remove="SFX\sfx_redo.wav" />
       <None Remove="SFX\sfx_spawn.wav" />
       <None Remove="SFX\sfx_undo.wav" />
@@ -17,6 +18,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <EmbeddedResource Include="SFX\sfx_deny.wav" />
       <EmbeddedResource Include="SFX\sfx_redo.wav" />
       <EmbeddedResource Include="SFX\sfx_spawn.wav" />
       <EmbeddedResource Include="SFX\sfx_undo.wav" />
diff --git a/PropUndoButton/SFX/sfx_deny.wav b/PropUndoButton/SFX/sfx_deny.wav
new file mode 100644
index 0000000..0a8b4ba
Binary files /dev/null and b/PropUndoButton/SFX/sfx_deny.wav differ