diff --git a/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/DataGridColumnHeadersPresenterAutomationPeer.cs b/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/DataGridColumnHeadersPresenterAutomationPeer.cs
index 90d79ea8788..09c2cd62d86 100644
--- a/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/DataGridColumnHeadersPresenterAutomationPeer.cs
+++ b/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/DataGridColumnHeadersPresenterAutomationPeer.cs
@@ -131,7 +131,7 @@ protected override List<AutomationPeer> GetChildrenCore()
 
                     // protection from indistinguishable items - for example, 2 strings with same value
                     // this scenario does not work in ItemsControl however is not checked for.
-                    if (ItemPeers[dataItem] == null)
+                    if (peer != null && ItemPeers[dataItem] == null)
                     {
                         children.Add(peer);
                         ItemPeers[dataItem] = peer;
diff --git a/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/GroupItemAutomationPeer.cs b/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/GroupItemAutomationPeer.cs
index a09f0d8194e..ef36a6c382b 100644
--- a/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/GroupItemAutomationPeer.cs
+++ b/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/GroupItemAutomationPeer.cs
@@ -274,8 +274,8 @@ protected override List<AutomationPeer> GetChildrenCore()
                             // but only if we haven't added a peer for this item during this GetChildrenCore call.
                             bool itemMissingPeerInGlobalStorage = itemsControlAP.ItemPeers[item] == null;
 
-                            if (itemMissingPeerInGlobalStorage
-                                || (peer?.GetParent() == this && addedChildren[item] == null))
+                            if (peer != null && (itemMissingPeerInGlobalStorage
+                                || (peer.GetParent() == this && addedChildren[item] == null)))
                             {
                                 children.Add(peer);
                                 addedChildren[item] = peer;
diff --git a/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/ItemsControlAutomationPeer.cs b/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/ItemsControlAutomationPeer.cs
index 890eb4f1a41..df43ac5f2cd 100644
--- a/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/ItemsControlAutomationPeer.cs
+++ b/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/ItemsControlAutomationPeer.cs
@@ -199,7 +199,7 @@ protected override List<AutomationPeer> GetChildrenCore()
 
                     // protection from indistinguishable items - for example, 2 strings with same value
                     // this scenario does not work in ItemsControl however is not checked for.
-                    if (_dataChildren[dataItem] == null)
+                    if (peer != null && _dataChildren[dataItem] == null)
                     {
                         children.Add(peer);
                         _dataChildren[dataItem] = peer;