diff --git a/src/SharpIDE.Godot/addons/R3.Godot/ObservableTrackerTab.cs b/src/SharpIDE.Godot/addons/R3.Godot/ObservableTrackerTab.cs
index a52ee32..18d4dab 100644
--- a/src/SharpIDE.Godot/addons/R3.Godot/ObservableTrackerTab.cs
+++ b/src/SharpIDE.Godot/addons/R3.Godot/ObservableTrackerTab.cs
@@ -28,7 +28,7 @@ public partial class ObservableTrackerTab : VBoxContainer
 
     public void NotifyOnSessionStart()
     {
-        debuggerPlugin!.SetEnableStates(sessionId, enableTracking, enableStackTrace);
+        debuggerPlugin?.SetEnableStates(sessionId, enableTracking, enableStackTrace);
     }
 
     public override void _Ready()