Level Manager Improvement

Assets/Scripts/Level/LevelManager.cs

@@ -77,6 +77,12 @@ namespace Level
         {
             DisableAllLevels();
 
+            if (!Levels.ContainsKey(levelNumber))
+            {
+                UIManager.Instance.SwitchToCanvas("Level Selection Menu");
+                return;
+            }
+
             currentLevel = Levels[levelNumber];
             currentLevel.Enable();