diff --git a/src/Avalonia.Controls.Recycling/ControlRecycling.cs b/src/Avalonia.Controls.Recycling/ControlRecycling.cs
index fd328200..360389ca 100644
--- a/src/Avalonia.Controls.Recycling/ControlRecycling.cs
+++ b/src/Avalonia.Controls.Recycling/ControlRecycling.cs
@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using Avalonia.Controls.Recycling.Model;
 using Avalonia.Controls.Templates;
@@ -64,14 +63,13 @@ public void Add(object data, object control)
     /// <returns></returns>
     public object? Build(object? data, object? existing, object? parent)
     {
-        if (data is null)
+        var key = data;
+        if (key is null)
         {
             return null;
         }
 
-        var key = data;
-
-        if (TryToUseIdAsKey && data is IControlRecyclingIdProvider idProvider)
+        if (TryToUseIdAsKey && key is IControlRecyclingIdProvider idProvider)
         {
             if (!string.IsNullOrWhiteSpace(idProvider.GetControlRecyclingId()))
             {
@@ -84,15 +82,15 @@ public void Add(object data, object control)
             return control;
         }
 
-        var dataTemplate = (parent as Control)?.FindDataTemplate(data);
+        var dataTemplate = (parent as Control)?.FindDataTemplate(key);
 
-        control = dataTemplate?.Build(data);
+        control = dataTemplate?.Build(key);
         if (control is null)
         {
             return null;
         }
 
-        Add(key, control);
+        Add(key!, control);
 
         return control;
     }
diff --git a/src/Dock.Model/FactoryBase.Dockable.cs b/src/Dock.Model/FactoryBase.Dockable.cs
index b5a9330b..2cc4acb9 100644
--- a/src/Dock.Model/FactoryBase.Dockable.cs
+++ b/src/Dock.Model/FactoryBase.Dockable.cs
@@ -353,10 +353,10 @@ public void PreviewPinnedDockable(IDockable dockable)
 
         Debug.Assert(rootDock.PinnedDock != null);
 
-        RemoveAllVisibleDockables(rootDock.PinnedDock);
+        RemoveAllVisibleDockables(rootDock.PinnedDock!);
 
         dockable.OriginalOwner = dockable.Owner;
-        AddVisibleDockable(rootDock.PinnedDock, dockable);
+        AddVisibleDockable(rootDock.PinnedDock!, dockable);
     }
 
     /// <inheritdoc/>
@@ -527,7 +527,7 @@ public virtual void PinDockable(IDockable dockable)
                     else
                     {
                         Debug.Assert(dockable.OriginalOwner is IDock);
-                        var originalOwner = (IDock)dockable.OriginalOwner;
+                        var originalOwner = (IDock)dockable.OriginalOwner!;
                         HidePreviewingDockables(rootDock);
                         AddVisibleDockable(originalOwner, dockable);
                     }