diff --git a/UaClient/ServiceModel/Ua/ExpandedNodeId.cs b/UaClient/ServiceModel/Ua/ExpandedNodeId.cs
index b3f1414..5ab3bd5 100644
--- a/UaClient/ServiceModel/Ua/ExpandedNodeId.cs
+++ b/UaClient/ServiceModel/Ua/ExpandedNodeId.cs
@@ -196,7 +196,7 @@ public override int GetHashCode()
         {
             int hashCode = -641591048;
             hashCode = hashCode * -1521134295 + EqualityComparer<NodeId>.Default.GetHashCode(NodeId);
-            hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(NamespaceUri);
+            if (NamespaceUri != null) hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(NamespaceUri);
             hashCode = hashCode * -1521134295 + ServerIndex.GetHashCode();
             return hashCode;
         }
diff --git a/UaClient/ServiceModel/Ua/LocalizedText.cs b/UaClient/ServiceModel/Ua/LocalizedText.cs
index a07c459..5f377a9 100644
--- a/UaClient/ServiceModel/Ua/LocalizedText.cs
+++ b/UaClient/ServiceModel/Ua/LocalizedText.cs
@@ -50,8 +50,8 @@ public bool Equals(LocalizedText? other)
         public override int GetHashCode()
         {
             int hashCode = 670029253;
-            hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(Text);
-            hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(Locale);
+            if (Text != null) hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(Text);
+            if (Locale != null) hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(Locale);
             return hashCode;
         }
 
diff --git a/UaClient/ServiceModel/Ua/QualifiedName.cs b/UaClient/ServiceModel/Ua/QualifiedName.cs
index ce8cf01..b39a668 100644
--- a/UaClient/ServiceModel/Ua/QualifiedName.cs
+++ b/UaClient/ServiceModel/Ua/QualifiedName.cs
@@ -79,7 +79,7 @@ public bool Equals(QualifiedName? other)
         public override int GetHashCode()
         {
             int hashCode = 978021522;
-            hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(Name);
+            if (Name != null) hashCode = hashCode * -1521134295 + EqualityComparer<string?>.Default.GetHashCode(Name);
             hashCode = hashCode * -1521134295 + NamespaceIndex.GetHashCode();
             return hashCode;
         }