diff --git a/OpenTaiko/src/Stages/04.Config/CActCalibrationMode.cs b/OpenTaiko/src/Stages/04.Config/CActCalibrationMode.cs
index 3768f480..636b2166 100644
--- a/OpenTaiko/src/Stages/04.Config/CActCalibrationMode.cs
+++ b/OpenTaiko/src/Stages/04.Config/CActCalibrationMode.cs
@@ -23,8 +23,8 @@ namespace TJAPlayer3
         {
             Stop();
             Offsets.Clear();
-            font.Dispose();
-            offsettext.Dispose();
+            font?.Dispose();
+            offsettext?.Dispose();
             //hitSound?.tDispose();
 
             base.DeActivate();