diff --git a/Assets/Scripts/PlayMenu.cs b/Assets/Scripts/PlayMenu.cs
index 5b52f3b..a20bf90 100644
--- a/Assets/Scripts/PlayMenu.cs
+++ b/Assets/Scripts/PlayMenu.cs
@@ -94,6 +94,7 @@ public class PlayMenu : MonoBehaviour
 
     void ValidateTotal()
     {
+        customBackButton.interactable = false;
         customPlayButton.interactable = false;
         customNormalizeButton.interactable = false;
         float total = 0f;