diff --git a/sdk/network/Azure.ResourceManager.Network/CHANGELOG.md b/sdk/network/Azure.ResourceManager.Network/CHANGELOG.md
index 5a7af8e0c99a..78c7eb9b5a8d 100644
--- a/sdk/network/Azure.ResourceManager.Network/CHANGELOG.md
+++ b/sdk/network/Azure.ResourceManager.Network/CHANGELOG.md
@@ -1,14 +1,10 @@
 # Release History
 
-## 1.12.0-beta.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 1.11.1 (2025-07-01)
 
 ### Bugs Fixed
 
-### Other Changes
+- Fixed an issue that if `LoadBalancingRuleData.FrontendIPConfigurationId` or other hidden properties on `LoadBalancingRuleData` class are assigned with values, the corresponding service operation would fail with `NullReferenceException` because the collection properties on `LoadBalancingRuleData` class are not initialized.
 
 ## 1.11.0 (2025-05-22)
 
diff --git a/sdk/network/Azure.ResourceManager.Network/src/Azure.ResourceManager.Network.csproj b/sdk/network/Azure.ResourceManager.Network/src/Azure.ResourceManager.Network.csproj
index ca158ce78b99..4a485684c409 100644
--- a/sdk/network/Azure.ResourceManager.Network/src/Azure.ResourceManager.Network.csproj
+++ b/sdk/network/Azure.ResourceManager.Network/src/Azure.ResourceManager.Network.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Version>1.12.0-beta.1</Version>
+    <Version>1.11.1</Version>
     <!--The ApiCompatVersion is managed automatically and should not generally be modified manually.-->
     <ApiCompatVersion>1.11.0</ApiCompatVersion>
     <PackageId>Azure.ResourceManager.Network</PackageId>
diff --git a/sdk/network/Azure.ResourceManager.Network/src/Customization/LoadBalancingRuleData.cs b/sdk/network/Azure.ResourceManager.Network/src/Customization/LoadBalancingRuleData.cs
index ea19aa453ace..41695ce1fbcb 100644
--- a/sdk/network/Azure.ResourceManager.Network/src/Customization/LoadBalancingRuleData.cs
+++ b/sdk/network/Azure.ResourceManager.Network/src/Customization/LoadBalancingRuleData.cs
@@ -3,9 +3,9 @@
 
 #nullable disable
 
-using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Runtime.CompilerServices;
 using Azure.Core;
 using Azure.ResourceManager.Network.Models;
 using Azure.ResourceManager.Resources.Models;
@@ -14,6 +14,12 @@ namespace Azure.ResourceManager.Network
 {
     public partial class LoadBalancingRuleData : NetworkResourceData
     {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void EnsureProperties()
+        {
+            Properties ??= new LoadBalancingRuleProperties(default, default);
+        }
+
         /// <summary> Gets or sets Id. </summary>
         [EditorBrowsable(EditorBrowsableState.Never)]
         public ResourceIdentifier FrontendIPConfigurationId
@@ -21,10 +27,7 @@ public ResourceIdentifier FrontendIPConfigurationId
             get => Properties?.FrontendIPConfigurationId;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.FrontendIPConfigurationId = value;
             }
         }
@@ -36,17 +39,21 @@ public ResourceIdentifier BackendAddressPoolId
             get => Properties?.BackendAddressPoolId;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.BackendAddressPoolId = value;
             }
         }
 
         /// <summary> An array of references to pool of DIPs. </summary>
         [EditorBrowsable(EditorBrowsableState.Never)]
-        public IList<WritableSubResource> BackendAddressPools => Properties?.BackendAddressPools;
+        public IList<WritableSubResource> BackendAddressPools
+        {
+            get
+            {
+                EnsureProperties();
+                return Properties.BackendAddressPools;
+            }
+        }
 
         /// <summary> Gets or sets Id. </summary>
         [EditorBrowsable(EditorBrowsableState.Never)]
@@ -55,10 +62,7 @@ public ResourceIdentifier ProbeId
             get => Properties?.ProbeId;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.ProbeId = value;
             }
         }
@@ -70,10 +74,7 @@ public LoadBalancingTransportProtocol? Protocol
             get => Properties?.Protocol;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.Protocol = value ?? default;
             }
         }
@@ -85,10 +86,7 @@ public LoadDistribution? LoadDistribution
             get => Properties?.LoadDistribution;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.LoadDistribution = value;
             }
         }
@@ -100,10 +98,7 @@ public int? FrontendPort
             get => Properties?.FrontendPort;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.FrontendPort = value ?? default;
             }
         }
@@ -115,10 +110,7 @@ public int? BackendPort
             get => Properties?.BackendPort;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.BackendPort = value;
             }
         }
@@ -130,10 +122,7 @@ public int? IdleTimeoutInMinutes
             get => Properties?.IdleTimeoutInMinutes;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.IdleTimeoutInMinutes = value;
             }
         }
@@ -145,10 +134,7 @@ public bool? EnableFloatingIP
             get => Properties?.EnableFloatingIP;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.EnableFloatingIP = value;
             }
         }
@@ -160,10 +146,7 @@ public bool? EnableTcpReset
             get => Properties?.EnableTcpReset;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.EnableTcpReset = value;
             }
         }
@@ -175,10 +158,7 @@ public bool? DisableOutboundSnat
             get => Properties?.DisableOutboundSnat;
             set
             {
-                if (Properties is null)
-                {
-                    Properties = new LoadBalancingRuleProperties();
-                }
+                EnsureProperties();
                 Properties.DisableOutboundSnat = value;
             }
         }