diff --git a/MixItUp.Base/ViewModel/Commands/CrowdControlEffectCommandEditorWindowViewModel.cs b/MixItUp.Base/ViewModel/Commands/CrowdControlEffectCommandEditorWindowViewModel.cs
index 3b575003c..b62470027 100644
--- a/MixItUp.Base/ViewModel/Commands/CrowdControlEffectCommandEditorWindowViewModel.cs
+++ b/MixItUp.Base/ViewModel/Commands/CrowdControlEffectCommandEditorWindowViewModel.cs
@@ -43,7 +43,7 @@ public CrowdControlGame SelectedGame
         }
         private CrowdControlGame selectedGame;
 
-        public ObservableCollection<CrowdControlGamePack> Packs { get; private set; } = new ObservableCollection<CrowdControlGamePack>();
+        public ThreadSafeObservableCollection<CrowdControlGamePack> Packs { get; private set; } = new ThreadSafeObservableCollection<CrowdControlGamePack>();
 
         public CrowdControlGamePack SelectedPack
         {
@@ -66,7 +66,7 @@ public CrowdControlGamePack SelectedPack
         }
         private CrowdControlGamePack selectedPack;
 
-        public ObservableCollection<CrowdControlGamePackEffect> Effects { get; private set; } = new ObservableCollection<CrowdControlGamePackEffect>();
+        public ThreadSafeObservableCollection<CrowdControlGamePackEffect> Effects { get; private set; } = new ThreadSafeObservableCollection<CrowdControlGamePackEffect>();
 
         public CrowdControlGamePackEffect SelectedEffect
         {