diff --git a/Content.Shared/UserInterface/ActivatableUIComponent.cs b/Content.Shared/UserInterface/ActivatableUIComponent.cs
index 74e6134932..136a1f82cf 100644
--- a/Content.Shared/UserInterface/ActivatableUIComponent.cs
+++ b/Content.Shared/UserInterface/ActivatableUIComponent.cs
@@ -8,7 +8,7 @@ namespace Content.Shared.UserInterface
     public sealed partial class ActivatableUIComponent : Component
     {
         [DataField(required: true, customTypeSerializer: typeof(EnumSerializer))]
-        public Enum Key { get; set; } = default!;
+        public Enum? Key { get; set; } = default!;
 
         [ViewVariables(VVAccess.ReadWrite)]
         [DataField]
diff --git a/Content.Shared/UserInterface/ActivatableUISystem.Power.cs b/Content.Shared/UserInterface/ActivatableUISystem.Power.cs
index c904224328..64099c9573 100644
--- a/Content.Shared/UserInterface/ActivatableUISystem.Power.cs
+++ b/Content.Shared/UserInterface/ActivatableUISystem.Power.cs
@@ -21,7 +21,8 @@ public sealed partial class ActivatableUISystem
         _cell.SetPowerCellDrawEnabled(uid, false);
 
         if (HasComp<ActivatableUIRequiresPowerCellComponent>(uid) &&
-            TryComp<ActivatableUIComponent>(uid, out var activatable))
+            TryComp<ActivatableUIComponent>(uid, out var activatable) &&
+            activatable.Key != null)
         {
             _uiSystem.CloseUi(uid, activatable.Key);
         }
@@ -54,7 +55,7 @@ public sealed partial class ActivatableUISystem
     /// </summary>
     public void CheckUsage(EntityUid uid, ActivatableUIComponent? active = null, ActivatableUIRequiresPowerCellComponent? component = null, PowerCellDrawComponent? draw = null)
     {
-        if (!Resolve(uid, ref component, ref draw, ref active, false))
+        if (!Resolve(uid, ref component, ref draw, ref active, false) || active.Key == null)
             return;
 
         if (_cell.HasActivatableCharge(uid))
diff --git a/Content.Shared/UserInterface/ActivatableUISystem.cs b/Content.Shared/UserInterface/ActivatableUISystem.cs
index 452f08c094..94271cc681 100644
--- a/Content.Shared/UserInterface/ActivatableUISystem.cs
+++ b/Content.Shared/UserInterface/ActivatableUISystem.cs
@@ -136,7 +136,7 @@ public sealed partial class ActivatableUISystem : EntitySystem
 
     private bool InteractUI(EntityUid user, EntityUid uiEntity, ActivatableUIComponent aui)
     {
-        if (!_uiSystem.HasUi(uiEntity, aui.Key))
+        if (aui.Key == null || !_uiSystem.HasUi(uiEntity, aui.Key))
             return false;
 
         if (_uiSystem.IsUiOpen(uiEntity, aui.Key, user))
@@ -205,7 +205,7 @@ public sealed partial class ActivatableUISystem : EntitySystem
 
     public void CloseAll(EntityUid uid, ActivatableUIComponent? aui = null)
     {
-        if (!Resolve(uid, ref aui, false))
+        if (!Resolve(uid, ref aui, false) || aui.Key == null)
             return;
 
         _uiSystem.CloseUi(uid, aui.Key);